Grass Hay Production Guide

Grass Hay Production: Orchardgrass, Timothy, and Harvest Guide

Cool-season grass hay follows different production rules than alfalfa — different maturity indicators, different drying behavior, different conditioning requirements, and different market channels. Producers who apply alfalfa management protocols to orchardgrass or timothy miss quality opportunities that are specific to grass biology. This guide covers the production management differences that separate average grass hay from the premium grades that access horse and direct-market channels at $30–$80 per ton above commodity grass hay prices.

Species Overview

Cool-Season Grass Species: How Each One Differs in Production

The major cool-season grass hay species — orchardgrass, timothy, smooth bromegrass, tall fescue, and perennial ryegrass — each have distinct growth habits, maturity timing, market positions, and management requirements. Managing them as a single category produces average results. Matching management to species produces the premium quality that commands premium prices.

Species Cutting stage target Drying speed Peak market Annual cuttings
Orchardgrass Boot to early head Fast (flat leaf) Horse, rabbit, guinea pig 2–4
Timothy Boot to early head Moderate (dense stem) Horse, export (Japan/Korea) 2–3
Smooth bromegrass Boot to pre-head Moderate Horse, beef cattle 2–3
Tall fescue Boot stage — before head emergence Moderate (thick stem) Cattle, endophyte-free varieties for horse 2–4
Perennial ryegrass Head emergence Fastest Dairy, silage 3–5

Cutting Stage for Grass Hay Quality: The Boot Stage Window

mower-conditioner on grass hay stand — cutting stage is the primary quality determinant for cool-season grass hay; boot stage cutting captures peak nutritional quality before heading reduces digestibility and increases fiber content

In alfalfa, the maturity trigger is bloom stage — visible flowers. In cool-season grasses, the equivalent quality-timing indicator is the boot stage — the period just before the seed head emerges from the uppermost leaf sheath. At boot stage, the grass has maximum digestibility (NDFD), acceptable protein (10–14% CP), and has not yet lignified the stem tissue that reduces ADF and NDF digestibility after heading.

Boot stage identification (target)

The seed head is visible as a swelling in the flag leaf sheath — you can feel the bulge when you run your fingers up the stem — but it has not yet broken through the leaf. At this stage the stem is still flexible and contains high levels of non-structural carbohydrates. For horse and premium markets, cut at late boot to flag leaf emergence — before any seed head is visible above the top leaf. For livestock hay where moderate quality is acceptable, cutting at early head emergence (seedhead just visible) is acceptable but produces lower-grade hay.

Post-heading quality loss (avoid)

Once the seed head has fully emerged and the grass begins to shed pollen (anthesis), ADF and NDF values climb rapidly. An orchardgrass stand cut at boot stage may test RFV 170; the same stand cut 10 days later at full head emergence may test RFV 140 — a 30-point quality reduction from a single week’s delay. Unlike alfalfa where delayed cutting loses 1–2 points per day, grass quality in the heading period can drop 3–5 points per day under warm conditions. The boot stage window is narrow — typically 5–10 days — and monitoring is required to catch it each cutting.

Conditioning Grass Hay: Different Stem Types Need Different Approaches

Cool-season grasses vary significantly in stem structure — from the flat, broad leaves of orchardgrass to the dense, thick culms of timothy — and each stem type responds differently to conditioning. Applying the same conditioner gap setting that works well for alfalfa to all grass species produces inconsistent results across a mixed operation.

Orchardgrass
Flat, broad leaves with relatively thin culms dry quickly — orchardgrass at boot stage can reach baling moisture in 18–24 hours in good summer conditions without conditioning. When conditioning is used, a wide roll gap (4–6 mm) is appropriate — tighter gaps cause excessive leaf damage on the broad, fragile leaves. Orchardgrass loses leaves more readily than timothy or bromegrass; minimize unnecessary field passes after cutting.
Timothy
Dense, cylindrical culms with a waxy exterior cuticle that resists drying without conditioning. Timothy genuinely benefits from aggressive conditioning — the cuticle must be cracked to allow moisture to escape from the stem tissue. Use a tighter roll gap (2–3 mm) and confirm conditioning is working with the drying time test. Well-conditioned timothy dries at a rate comparable to alfalfa; unconditioned timothy takes significantly longer. The stem-to-leaf ratio is lower in timothy than orchardgrass, so leaf damage from tight conditioning is less of a quality concern.
Smooth bromegrass
Intermediate stem structure between orchardgrass and timothy. Benefits from conditioning but less critically than timothy. Standard 3–4 mm gap suitable for most conditions. Bromegrass is the most tolerant of the three species to variable conditioning settings — quality outcomes are less sensitive to precise gap management.

Raking Grass Hay: Timing for Leaf Retention

hay raking equipment in field — the optimal raking window for grass hay is 18-24% crop moisture when leaves are flexible enough to flex over the rake tines without shattering; raking too dry on orchardgrass or bromegrass causes significant leaf loss from the broadleaf species

Grass hay raking timing is governed by the same moisture principles as alfalfa — rake when leaves are still flexible enough to flex over tines without shattering — but the specific moisture thresholds and the sensitivity to leaf loss differ by species. Broad-leaf grasses (orchardgrass, bromegrass) lose more leaf per unit of over-drying than narrow-blade grasses (timothy, ryegrass) because their larger leaf surface area presents more contact points with the rake tines.

Orchardgrass: rake at 25–35% moisture

Orchardgrass leaves are broad and have a low tensile strength at their attachment to the stem — they detach easily when dry and brittle. Rake orchardgrass at higher moisture (25–35%) than you would alfalfa, accepting a slightly wet windrow for the baler to process later. Raking at below 20% moisture on orchardgrass routinely causes 8–15% leaf loss — the visible “tan carpet” of shed leaves visible behind the rake that represents the highest-quality fraction of the hay disappearing into the field.

Timothy: rake at 20–30% moisture

Timothy’s narrow leaves are more resistant to shatter than orchardgrass, allowing a slightly lower rake moisture without comparable leaf loss. However, timothy’s dense culms mean the windrow center dries more slowly than the surface — a rake moisture reading of 20% at the surface may correspond to 28%+ at the windrow center. Take probe readings at windrow depth before raking and base the timing on the deepest readings, not the surface.

Premium Grass Hay Markets: Who Buys and What They Pay

Premium grass hay commands prices equal to or above conventional alfalfa in specific market channels — primarily horse markets and international export. Producers who understand these channels and produce to their specifications consistently access the highest prices for grass hay production. The key insight: grass hay premiums are earned by meeting specific quality criteria that differ from alfalfa, not by simply being a “grass type.”

Horse market: orchardgrass and timothy

Horse owners — particularly those managing sport horses, racehorses, or metabolically sensitive horses — often prefer grass hay because its lower protein (10–14% CP) and lower nonstructural carbohydrate (NSC) content reduces the risk of metabolic and digestive issues that high-protein alfalfa can cause. Premium horse grass hay specifications: RFV 140–170, CP 10–14%, NSC below 12%, moisture below 14%, very low ash, golden color, minimal dust. Horse hay at this specification commands $180–$280/ton in most eastern and midwestern markets.

Export timothy (Pacific Northwest)

Japan, South Korea, and Taiwan import significant quantities of U.S. timothy hay for horses and small animals. Japanese export timothy specifications are stringent: color grade is as important as nutritional grade; dust must be virtually absent; moisture below 14%; seed head presentation (fully developed at cutting, consistent color) is evaluated visually. Pacific Northwest timothy grown under optimal irrigation and climate conditions is the primary source for this market. Export timothy can command $250–$380/ton FOB Pacific port, making it one of the highest-value grass hay markets in the U.S.

Small animal and rabbit market

Orchardgrass and timothy hay packaged for small animals (rabbits, guinea pigs, chinchillas) command extremely high retail prices per pound — equivalent to $600–$1,200+/ton at consumer retail, though producers typically sell to distributors at $200–$400/ton. Requirements: virtually zero dust, no mold spores, bright fresh color, no seed heads (for some products), very low moisture. Small-scale farm-direct operations in suburban and peri-urban markets can sometimes access consumer prices directly, bypassing the distributor margin.

The complete quality management decisions from cutting through baling that determine whether grass hay achieves premium or commodity grade are in the hay quality improvement guide. The mowing and conditioning equipment setup that maximizes drying rate while protecting grass leaf retention is in the mowing and conditioning quality guide. The gearbox and driveline specifications for mower-conditioners used on grass stands are in agricultural gearbox and PTO driveline component specifications.

Grass Hay Production Calendar: Key Decisions by Season

farm equipment PTO drive components — mower-conditioner PTO drive specifications determine conditioning intensity on grass stands; equipment sized for alfalfa production is adequate for cool-season grass conditioning with appropriate gap adjustment for each grass species' stem structure

Season Key action Species-specific note
Early spring (greenup) Walk fields, assess density and stand health; apply potassium and phosphorus if soil test indicates deficiency Timothy: note whether tiller density is adequate (5+ tillers/sq ft); thin stands need reseeding before first cut
First cutting (May–June) Monitor boot stage weekly once grass reaches 12 inches; mow at boot stage; condition at species-appropriate gap Orchardgrass boots 2–3 weeks earlier than timothy in mixed stands — consider separate field management by species for quality optimization
Second cutting (July–August) Allow 35–45 days recovery between cuts; second-cut grass typically produces lower yield but similar or slightly lower quality than first cut depending on summer heat Timothy: second-cut yield is typically 40–60% of first-cut yield; don’t overestimate second-cut production when planning market commitments
Fall management Allow 4–6 weeks of growth before frost for carbohydrate root reserve accumulation; do not cut within 6 weeks of expected first hard frost Cool-season grasses are less sensitive to fall cutting date than alfalfa but still benefit from the fall rest; stand persistence is better with a 4-week fall growth period before dormancy

Stand Persistence and Renovation Triggers for Grass Hay

Unlike alfalfa, cool-season grasses do not have the same dramatic thinning from over-cutting — they spread vegetatively and can partially self-heal gaps through tillering and rhizome growth. However, grass stands do decline over time from soil fertility depletion, compaction, pest damage, and weed ingress. Knowing when a stand has declined below economic productivity — and when renovation or overseeding can restore it — prevents investing in management on a stand that should be replaced.

Signs the stand is still productive
  • Canopy closes within 3–4 weeks of cutting with uniform regrowth
  • Few visible weed patches covering less than 15% of field area
  • Yield comparable to prior seasons without increased inputs
  • Forage tests consistent with stand age and management
Signs renovation is needed
  • More than 25–30% of field area dominated by undesirable grass or broadleaf weeds
  • Yield below 2 tons/acre per cutting on sites with adequate fertility and moisture
  • Bare areas that do not fill in between cuttings
  • Forage quality consistently below market-acceptable grade despite early cutting
Overseeding vs full renovation

Overseeding works when the existing stand is 60%+ desirable species with uniform gaps — new seedlings fill gaps alongside existing plants. Full renovation (tillage, reseeding) is required when the existing stand is less than 50% desirable species or when the weed complex prevents new grass seedling establishment through competition or allelopathic interference.

Grass Hay Production FAQs

Does grass hay need nitrogen fertilizer, or does it fix its own?+
Pure grass stands do not fix nitrogen — they require applied nitrogen to maintain yield and protein levels. Alfalfa’s nitrogen fixation is a legume-specific trait that does not transfer to grass species. A grass hay stand producing 3–5 tons per acre per year requires 80–120 lbs of actual nitrogen per acre annually to maintain productivity and protein content. Without nitrogen fertilization, grass stands progressively lose productivity and protein content as the soil nitrogen supply is depleted by repeated harvesting. The nitrogen can come from any combination of synthetic fertilizer, manure application, or organic amendments (in organic systems). Apply nitrogen in split applications — some at greenup and some after each cutting — rather than a single large application that invites leaching and luxury consumption without corresponding quality benefit.
Can I convert an alfalfa field to grass hay without full renovation?+
Interseeding cool-season grasses into a thinning alfalfa stand is possible but has a lower success rate than full renovation due to alfalfa autotoxicity — the allelopathic compounds alfalfa roots release suppress new seedling germination, and this extends to grass seedlings in close proximity to alfalfa roots. If the alfalfa stand has significant gaps (less than 2 plants per square foot across substantial areas), the autotoxicity effect is less concentrated in the gap areas and grass seeding success is higher. The more practical transition approach: terminate the alfalfa, grow a non-allelopathic annual crop (corn or small grain) for one season to break the autotoxicity cycle, then establish the grass stand. This adds a year but produces a much cleaner establishment without the persistent competition from declining alfalfa plants.
Why does my orchardgrass hay test lower quality than my neighbor’s from the same field type?+
Quality differences in orchardgrass from similar fields almost always come down to cutting stage and raking timing. If the neighbor consistently cuts at late boot (visible stem bulge before head emergence) while you cut at early head (head just visible), the quality difference is 15–25 RFV points — a full grade-level difference. Walk your neighbor’s field the day they cut and note the plant stage you observe — if they are cutting visibly earlier than you, that is the primary explanation. The second most common cause is raking timing — if you rake at too-dry moisture and lose a significant leaf fraction on the broad orchardgrass leaves, the remaining stem-heavy material tests at lower quality. Test your hay and your neighbor’s hay from the same cutting and compare not just RFV but the component values (ADF, NDF, CP) — the pattern of differences will point to which production step is causing the quality gap.
Does grass hay need conditioning, or can I cut without a conditioner?+
It depends strongly on the species. Orchardgrass with flat, broad leaves dries relatively quickly even without conditioning in warm, dry weather — the large leaf area provides good evaporative surface. In favorable summer conditions, orchardgrass can reach baling moisture in 24–36 hours without conditioning. Timothy, in contrast, has a dense cylindrical culm with a thick cuticle that genuinely resists drying without conditioning — unconditioned timothy typically takes 50–80% longer to dry than conditioned timothy under equivalent weather conditions. The quality risk of unconditioned timothy is not just longer drying time — extended field exposure increases the probability of rain contact and overnight dew re-wetting cycles that progressively degrade quality. For timothy production, a mower-conditioner with correctly gapped conditioning rolls is essentially required for consistent quality outcomes across variable weather. For orchardgrass in drier climates, cutting without conditioning is workable in favorable conditions but adds weather risk.
How does grass hay compare to alfalfa in total net revenue per acre?+
On suitable sites for both crops, premium alfalfa typically produces higher net revenue per acre than grass hay sold into standard livestock markets — alfalfa’s higher yield, more cuttings per year, and higher per-ton price usually wins on a total revenue basis. However, the comparison changes meaningfully when premium grass hay markets are accessible. Premium orchardgrass at $220/ton × 4 tons/acre = $880/acre vs. standard alfalfa at $175/ton × 5 tons/acre = $875/acre — essentially equivalent. Premium timothy for export or horse markets at $280/ton × 3 tons/acre = $840/acre vs alfalfa. The key variable is market access — grass hay’s net revenue advantage is entirely dependent on reaching buyers who pay the quality premium. Grass hay at commodity livestock prices ($120–$140/ton) cannot match alfalfa economics on equivalent sites. Build the market relationship first, then evaluate the species switch on the financial model for your specific price access and soil conditions.
What NSC level should I target for metabolically sensitive horses?+
Horses with metabolic conditions (equine metabolic syndrome, insulin dysregulation, or laminitis history) are typically managed on hay with NSC (non-structural carbohydrates = water-soluble carbohydrates + starch) below 10–12% of dry matter, as recommended by most equine veterinary nutritionists. Cool-season grasses naturally vary in NSC depending on cutting time of day (grasses accumulate NSC through the day via photosynthesis and have lowest NSC in the early morning), weather (cool nights cause NSC accumulation), and cutting stage (boot stage grass has lower NSC than mature grass that has been storing carbohydrates longer). To produce low-NSC grass hay: cut in the early morning after a warm night (NSC lowest); cut at boot stage rather than later maturity; avoid cutting during or after periods of cold nights (below 40°F) which cause NSC accumulation. Have hay tested for NSC (not all routine forage tests include it — request the ESC + starch panel) to confirm it meets the sub-10% threshold for your horse customers’ needs.

foragebaler.com hay production equipment configured for cool-season grass production — mower-conditioner and baler systems for orchardgrass, timothy, and mixed grass stands

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