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Small Grain Harvest Guide: Oats, Barley, and Rye

Harvest · September 2025 · 5 min read

Oats, barley, and rye each have unique harvest requirements that affect grain quality and storage life. Moisture targets and combine settings differ between species, and using the wrong approach increases cracking, hull damage, and spoilage risk. This guide covers the essentials for each crop.

Moisture Targets by Grain

Each small grain has a specific safe storage moisture and ideal harvest window:

• Oats: Harvest at 14% moisture or below for safe storage; combine at up to 16% if drying is available
• Barley: Target 13.5% for malting barley, 14% for feed; malting barley requires careful handling to avoid skinning
• Rye: Harvest at 13–14% moisture; rye shatters easily once overripe, so timeliness is critical

Combine Adjustments

Small grains require lower cylinder or rotor speeds and wider concave clearance compared to corn or soybeans. Oats are particularly prone to hull damage at high speeds. For barley, reduce rotor speed to minimize skinning, which lowers malting grade. Rye kernels are small, so tighten sieve and chaffer settings to reduce losses out the back.

Check the grain tank frequently for cracked or skinned kernels and adjust accordingly.

Test Weight Standards and Storage

U.S. test weight standards for No. 1 grade are 36 lb/bu for oats, 48 lb/bu for barley, and 56 lb/bu for rye. Store small grains in clean, dry bins with adequate aeration. Cool grain to below 50°F within a few weeks of binning to prevent insect activity. Monitor temperature monthly throughout storage.