How to Mitigate Risk: What to Do if Rain Hits During Haying

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Introduction

Every hay producer dreads the sound of rain on freshly cut forage. Despite careful weather tracking, unexpected rain during haying can happen — and when it does, quick action can mean the difference between minor loss and ruined feed.

This guide explains how rain affects hay quality and the steps you can take before, during, and after a storm to protect your investment.

How Rain Affects Hay Quality

Rain primarily causes leaching — the washing away of soluble nutrients like sugars, proteins, and minerals. Prolonged wet conditions can also promote:

  • Mold growth and spoilage
  • Loss of color and leaf shatter
  • Reduced dry matter yield

According to the University of Wisconsin Extension, just one inch of rain on semi-dry hay can reduce total digestible nutrients (TDN) by 5–15% and cause up to 30% dry matter loss.

Before the Rain: Plan and Prepare

  1. Watch Forecasts Closely
    Use multiple weather apps and radar updates before cutting. Don’t rely on a single forecast.
  2. Cut Smaller Sections
    Harvesting in smaller batches reduces the area at risk if weather changes unexpectedly.
  3. Use a Conditioner or Crimper
    Equipment that crimps stems speeds up drying by 20–30%, helping hay reach safe moisture faster.
  4. Have Tarps or Bale Wrap Ready
    Keep covers and wrapping materials on hand in case storms form during curing or baling.

👉 External Resource: University of Kentucky Forage Extension shares advanced conditioning and hay curing practices for variable weather.

During the Rain: Protect What You Can

If rain catches you mid-harvest:

  • Stop raking or baling immediately to prevent compaction and further nutrient loss.
  • Move bales to high ground or onto pallets if already made.
  • Cover loose windrows with breathable tarps to minimize saturation.
  • Avoid driving on wet fields to prevent compaction or rutting.

If hay is still curing in the field, allow it to dry completely before re-raking to prevent mold formation.

After the Rain: Recovery Steps

Once conditions improve:

  1. Turn and Fluff Windrows
    Use a tedder or rake to speed up drying and reduce mold risk.
  2. Test Moisture Before Baling
    Ensure hay moisture is below 18% for small squares or 15% for round bales.
  3. Perform a Forage Test
    Lab testing determines whether the hay is suitable for high-performance livestock or better reserved for maintenance feeding.
  4. Monitor Stored Hay Closely
    Rain-damaged hay is more prone to heating — use temperature probes and ventilation.

👉 External Reference: Penn State Extension – Hay Storage Management offers safety guidelines for storing damp or weathered hay.

Salvaging Rain-Damaged Hay

While it’s not ideal, some rain-damaged hay can still be used effectively:

  • Feed to less demanding livestock like beef cows or mature horses.
  • Mix with silage or haylage to balance moisture and nutrient levels.
  • Compost any moldy, blackened, or foul-smelling bales — they’re unsafe for feed.

Never feed hay that’s musty, dusty, or hot to the touch — it could cause respiratory or digestive problems in animals.

Final Thoughts

Rain during haying is every farmer’s challenge, but with planning and quick response, losses can be minimized.
The key is to act fast: protect what’s been cut, let fields dry thoroughly, and test the hay before feeding or selling.

By combining smart timing, modern equipment, and a recovery plan, you can protect both hay quality and profitability — no matter what the weather brings.

Author: Premium Hay Supply Editorial Team
Featured Image Alt Text: stylized vector of farmer in rain field covering hay bales, showing tractor and dark clouds overhead.