{"id":1182,"date":"2026-07-29T03:33:24","date_gmt":"2026-07-29T03:33:24","guid":{"rendered":"https:\/\/foragebaler.com\/?p=1182"},"modified":"2026-07-29T03:33:24","modified_gmt":"2026-07-29T03:33:24","slug":"best-time-of-day-to-bale-hay","status":"publish","type":"post","link":"https:\/\/foragebaler.com\/ko\/best-time-of-day-to-bale-hay\/","title":{"rendered":"Best Time of Day to Bale Hay"},"content":{"rendered":"
Hay Baling Timing \u00b7 Moisture Management \u00b7 All Crop Types<\/p>\n
Hay moisture at baling is not fixed from the moment cutting is complete \u2014 it changes hour by hour as temperature rises and falls, humidity fluctuates and overnight dew re-wets the windrow. The difference between 14:00 and 09:00 baling from the same windrow can be the difference between 15% moisture and 22% moisture in the bale. This guide explains exactly what is happening in the windrow through the day and how to read the conditions for your specific region.<\/p>\n
Covers: dew point \u00b7 relative humidity \u00b7 morning risks \u00b7 afternoon window \u00b7 evening limits \u00b7 regional differences \u00b7 weather forecast reading<\/p>\n
A windrow that reached 15% moisture at 14:00 on Day 3 after cutting can be at 20\u201322% moisture by 08:00 the following morning \u2014 not because it rained, but because overnight atmospheric moisture (dew) re-absorbed into the partially cured hay. Baling that same windrow at 08:00 instead of 14:00 produces bales that will heat, lose quality and potentially be rejected by premium buyers. Baling it at 14:00 produces a marketable product. The equipment, the crop and the field are identical \u2014 only the time differs.<\/p>\n
This diel (daily) moisture cycle in windrow hay is the most underappreciated factor in hay production quality. Understanding it allows you to predict your baling window reliably, avoid unnecessary field-drying delays and prevent the quality damage that comes from baling outside the safe moisture range.<\/p>\n
Most producers monitor relative humidity (RH) as their primary weather indicator for baling decisions. RH is the percentage of maximum moisture the air can hold at its current temperature. The problem: RH changes dramatically with temperature even when the absolute amount of water in the air is unchanged. At 10\u00b0C with 80% RH, the air holds 6.1 g\/m\u00b3 of water. At 30\u00b0C with 35% RH, the air holds approximately 11.0 g\/m\u00b3. The morning reading (80% RH) suggests high humidity; the afternoon reading (35% RH) suggests ideal conditions \u2014 but the air at 30\u00b0C actually contains nearly twice as much water per cubic metre. This apparent paradox is why experienced hay producers focus on dew point rather than RH alone.<\/p>\n
The dew point temperature is the temperature at which the air would become saturated with water vapour \u2014 the point at which condensation begins. Unlike RH, dew point does not change as temperature rises and falls through the day. A dew point of 12\u00b0C at 06:00 is still approximately 12\u00b0C at 16:00 on the same day (assuming no weather front has moved through). This stability makes dew point the most reliable single indicator for hay baling timing decisions.<\/p>\n
Excellent baling conditions. Low atmospheric moisture limits re-wetting potential. Morning baling may be feasible if windrow moisture is below 17% from previous day testing.<\/p>\n<\/div>\n
Typical baling conditions. Overnight re-wetting is moderate. Standard afternoon baling window (13:00\u201318:00) applies. Test moisture before starting.<\/p>\n<\/div>\n
High humidity region or season. Overnight re-wetting is significant. Afternoon baling window is shorter \u2014 start later (14:00\u201315:00) and stop earlier. Test more frequently.<\/p>\n<\/div>\n
Gulf Coast, Southeast summer conditions. Hay re-wetting is severe overnight. Afternoon baling window may be only 2\u20133 hours. Consider hay preservatives if this is routine.<\/p>\n<\/div>\n<\/div>\n
As air temperature falls after sunset, RH rises toward 100%. When the surface temperature of the windrow drops to the dew point temperature, moisture from the air begins condensing directly onto the hay surface \u2014 this is dew formation. Dew begins re-wetting the outer layer of the windrow at this point, typically between 22:00 and 02:00 depending on the season and location. By dawn, the windrow surface can have re-absorbed 4\u20138 percentage points of moisture compared to its late-afternoon reading.<\/p>\n
This morning surface moisture is real moisture that goes into the bale if you bale before it evaporates. An operator who measures windrow surface moisture at 08:00 and gets a reading of 18\u201320% is measuring primarily this dew moisture \u2014 but the windrow core was already at 15% moisture the previous afternoon. Baling at 08:00 produces a bale that will heat, even though the windrow was ready the day before.<\/p>\n
There are two situations where morning baling is correct. First: when the dew point is below 8\u00b0C and nighttime temperatures stayed well above the dew point \u2014 dew did not form because the windrow surface did not cool to the dew point. In arid western regions during summer, this condition is common and morning baling is frequently safe. Second: baling hay with a preservative at slightly elevated moisture \u2014 morning baling of hay at 18\u201320% moisture with applied preservative is an established practice for weather-pressured operations. Outside these specific conditions, morning baling of standard small square alfalfa or grass hay is the most common cause of heated bale lots.<\/p>\n
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The afternoon baling window opens when two conditions are met simultaneously: the windrow surface has dried from overnight dew (typically reached 2\u20133 hours after sunrise in sunny conditions), and the windrow core moisture has reached or remained below the target baling range. In most summer hay-baling regions, these conditions align between 12:00 and 14:00 on a clear day. The most common mistake in hay baling is starting too early \u2014 at 10:00 or 11:00 \u2014 when the windrow surface feels dry but the core is still carrying overnight re-wetting moisture from the surface layer inward.<\/p>\n
A reliable opening test: measure the windrow core moisture with a probe meter at 12:00. If the core reads below 17%, the window is open for standard small square baling. If it reads 17\u201319%, wait 60\u201390 minutes and test again. Temperature and solar radiation continue to drive moisture out of the core through mid-afternoon, so a reading of 18% at 12:00 often reaches 15\u201316% by 14:00 on a good day without any change in the windrow.<\/p>\n
The afternoon baling window closes when evening humidity begins to rise \u2014 typically between 17:00 and 19:00, though this varies significantly by region and season. The closing signal is not a clock time but a humidity reading: when relative humidity begins rising noticeably on your weather app or station and the windrow surface starts to feel slightly cool or damp to the touch, stop baling for the day. Bales produced in the last 30\u201360 minutes before dew formation begins may appear dry at baling but will absorb surface moisture as they sit in the field overnight before being moved to storage \u2014 particularly the bales on the outer surface of a row or stack.<\/p>\n
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In the irrigated desert and semi-arid western states, summer nights are frequently dry enough that dew does not form on windrows overnight. Dew point temperatures remain below 8\u201310\u00b0C even in the warmest months in many valley locations. In these conditions, the baling window is substantially wider: early morning baling of windrows that reached baling moisture the previous afternoon is safe because no overnight re-wetting occurred. Pacific Northwest producers in Eastern Washington and Oregon frequently start baling at 09:00 and bale through until 19:00 in peak summer, with minimal quality variation across the day.<\/p>\n
High summer dew points of 20\u201324\u00b0C are common across the Southeast and Gulf Coast. In these conditions, dew formation begins earlier in the evening (often by 20:00), is heavier and persists later into the morning (sometimes until 11:00 or later with cloud cover). The practical baling window on a typical Southeast summer day may be only 3\u20134 hours: 13:00\u201317:00. Producers in these regions who attempt to extend the window by starting at 10:00 or baling past 18:00 consistently produce heated lots. Management strategies: mow in narrower windrows to promote faster core drying, consider hay preservatives as a routine tool, and plan production volumes to match the compressed daily window rather than trying to extend it.<\/p>\n
The central states span a range of humidity conditions that shift significantly with weather patterns. In dry years with Canadian air masses, conditions approach the western arid window. In humid years with Gulf moisture, the window narrows toward southeastern conditions. The most reliable approach for Great Plains producers: check the dew point each morning before making a baling start time decision, rather than using a fixed clock start. A 06:00 dew point reading below 12\u00b0C on a forecast-sunny day suggests a 12:00\u201313:00 baling start is appropriate. A dew point above 18\u00b0C suggests pushing the start to 14:00 and stopping by 17:00.<\/p>\n
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