University of Minnesota Extension
Menu Menu

Extension home > Extension news > News Releases > Watch stored grain so little problems don't become big

Watch stored grain so little problems don't become big

By Bill Wilcke, University of Minnesota Extension

ST. PAUL, Minn. (2/22/2010) --This spring could be a critical time to monitor stored grain--especially higher moisture grain.

Some people are worried about possible freezing, thawing and refreezing of grain, resulting in hard-to-handle chunks. But keeping the grain just about the freezing point of water should prevent this from happening. If the grain is below freezing now, running aeration fans when the outdoor air is just above freezing should reduce problems.

University of Minnesota Extension recommendations are based on research done here and at other land-grant universities. Following these recommendations will help farmers and other grain handlers in the upper Midwest improve profitability and safety.

When you're warming grain, condensation will occur just ahead of the warming. If the fan is shut off prematurely, the condensed moisture could freeze. Leaving the fans on until the warming front has passed all the way through the bin can help avoid this problem. The University of Minnesota's WINFANS software program can be used to help estimate airflow and answer other questions. 

While winter is still with us, aerate grain as needed to maintain storage temperature. Fans can usually be shut off between aeration cycles. Once stored grain has cooled to 30 degrees, there's not much drying taking place; molds will grow slowly. But still check grain regularly--depending on its condition--for signs and smells of mold and stored-grain insects.

When spring comes, grain cooled  below 30 degrees must be warmed to prevent problems with condensation or frosting of equipment during summer. (You may not need to warm grain if it wasn't cooled below 30 degrees). During grain warming, fans must be left on until warming is complete. Grain must be dry before warm weather comes.

Work safely around stored grain. Use good respiratory equipment around dusty/moldy grain. Stay out of flowing grain, watch for bridged grain, and use fall protection when climbing bins or rail cars. If stored grain becomes infested with insects, fumigating to reduce insect populations is one option. Remember, fumigants are potentially dangerous chemicals.

Questions are taken through Extension's Farm Information Line at 1-800-232-9077, or email at Voicemail and email questions are answered the next business day and the service is free.

Any use of this article must include the byline or following credit line:
Bill Wilcke is an agricultural engineer with University of Minnesota Extension.

Media Contact: Catherine Dehdashti, U of M Extension, (612) 625-0237,

  • © 2015 Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy