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Hay Storage Fire Risks

Stored hay holds a lot of fuel in one place. Where and how you store it makes a big difference to how a fire, if one starts, will behave.

Why is stored hay a fire concern?

Hay is dry organic material that can burn quickly and hold heat. Large quantities concentrated in one building can create a fire that is hard to control, and a hay fire may smolder for a long time.

Hay may also ignite from within when stored damp. The separate article on spontaneous combustion explains this idea. Here we focus on storage choices.

A hay fire may be difficult to put out, and it can reignite after it seems to be finished, which is one reason to call the fire department and stay away.

• Large amount of fuel in one place
• Smoldering that can last a long time
• Possible reignition after the fire seems out

Where should hay be stored?

Where space allows, store hay away from barns, houses, fuel and machinery. Separate stacks or buildings limit how far a fire can spread. Ask your fire department and insurer about separation distances recommended for your area, since I will not state numbers here.

Keep the storage area clear of trash and vegetation, and make sure fire trucks can reach it, with gates wide enough and roads that can carry the weight.

If space is limited, talk with the fire department about the best compromise, and consider moving some hay to another location before the main season.

• Away from animals, people and fuel
• Several smaller stacks instead of one large one
• Clear access for fire trucks
• Open ground around the stack
• Ask the fire department about spacing
• Clear vegetation around the stack

How does moisture and weather affect storage?

Rain and humidity can soak stacks and add moisture. Cover hay or store it where rain cannot reach, and let air move so that moisture can escape. Wet hay is not only a fire risk, it spoils.

Check the storage after storms and during humid periods. Ask your extension agent how to check for heating and how long to watch after baling.

Mowing or clearing around storage, and removing old bales or chaff that has built up, reduces the fuel available near the stack.

What ignition sources should be kept away?

Keep welding, smoking, open flames, engines, heaters and electrical equipment away from stored hay. Do not park running or hot machines nearby. Check that wiring in or near the storage is in good shape.

Lightning, arson and children's play are also risks. Keep storage areas secured, and talk to children about why they must stay away.

• Welding and smoking
• Hot engines and heaters
• Damaged wiring
• Lightning, arson and children's play

How should stacks be arranged?

Leave aisles or gaps that allow air and access, and avoid stacking against walls or roofs where possible. Stack in a way that is stable, so that bales do not fall on people. Ask extension for guidance on arrangement.

Do not allow people to climb unstable stacks, and use safe methods for loading and unloading. Falling bales are a separate hazard.

Keep a clear path for loaders and trucks so that unloading does not force people to work in awkward or unsafe spots.

• Leave space for air and access
• Do not allow climbing on unstable stacks
• Use safe loading and unloading methods

What should be in your fire plan?

Tell the fire department where hay is stored and how to reach it. Agree how to call, who meets the trucks and where people will gather. Keep a phone available and post the address.

In a fire, keep people away and call 911. Do not enter a burning or smoking building. Hay fires can produce heavy smoke and may reignite after they seem out.

Review the plan with family and workers before hay season, since fires often happen when everyone is busy and tired.

• Share location and access with the fire department
• Post the farm address
• Keep a phone available

What about insurance and records?

Ask your agent how stored hay is covered and whether location or separation matters. Keep records of your inventory and storage layout. Photos help after a loss.

If you sell hay or store it for others, ask your agent about coverage for those situations as well.

Photograph the storage layout each year and keep the pictures with your insurance papers.

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.