Silo Fire Risks
Silo fires, whether in a tower or a bunker, are among the more difficult events a farm can face. This article gives general ideas only and points to experts.
Why are silo fires different?
Silos hold large amounts of material in a closed or semi-closed space. Fires inside can smolder where air is limited, produce heavy smoke and release gases that are dangerous to breathe. Access is often difficult and fighting the fire may need specialized training.
Because of this, the safest response for farm workers is to stay out and call for help. I will not describe firefighting steps here.
Different structures behave differently. Tower silos, bunkers, bags and grain bins each have their own hazards, so the details of your set-up matter.
- Smoldering where air is limited
- Heavy smoke and harmful gases
- Difficult access
- Specialized training is needed to fight these fires
What can cause a fire?
Sources of ignition and heating in stored crop material, electrical equipment, welding or cutting near the structure, and lightning are among the causes discussed by safety organizations. Heating of stored material can also occur.
Specific causes depend on the type of silo and the crop. Ask your county extension agent and your fire department about the risks for your set-up.
Keep a record of stored material and any changes you notice, since early warning signs are easier to interpret with a history.
- Heating of stored material
- Electrical equipment faults
- Hot work near the structure
- Lightning
What does prevention look like in principle?
Prevention focuses on managing the stored material, keeping ignition sources away, and maintaining electrical and mechanical equipment. Follow the manufacturer's instructions for your structure and equipment, and ask extension for the recommended practices for your crop.
Keep the area around silos clear of debris, vegetation and trash, and control access.
Ask your equipment dealer for the manual for any unloading or feeding equipment, and follow its maintenance schedule, because worn parts can create heat and sparks.
- Follow the manufacturer's guidance
- Keep ignition sources away
- Maintain electrical and mechanical equipment
- Keep the area clear and controlled
What about hot work near silos?
Welding, cutting and grinding near a silo are dangerous, especially when dust or stored material is nearby. Do these jobs only with careful planning and qualified people, and ask the fire department before starting.
Do not enter a silo to do hot work. Confined spaces have their own hazards, covered in separate resources from OSHA and NIOSH.
Plan ahead so that hot work is never an improvised job done in a hurry at the end of a long day.
- Ask whether neighboring departments can help
- Do not hot work inside or on the structure
What are the warning signs?
Smoke, unusual heat, odor or a change in the stored material may signal a problem. If you see or smell any of these, keep people away, call 911 and tell the dispatcher it is a silo fire.
Do not open hatches, climb or enter, because adding air can make a smoldering fire worse and gases inside can be harmful.
Tell everyone on the farm in advance that a smoking silo is an emergency, so no one tries to investigate alone.
- Smoke or unusual heat
- Strange odor
- Changes in stored material
Why should you never enter?
Silos and similar structures are confined spaces. Toxic gases, low oxygen, engulfment and fire can each be fatal, and rescuers can become victims. Only trained responders with the right equipment should go in.
Take the confined space and silo resources from OSHA and NIOSH seriously, and seek recognized training before any work in or near such structures.
If you are ever unsure whether it is safe to approach, stay back and call, since waiting costs little.
- Toxic gases and low oxygen
- Engulfment hazards
- Fire hazards
- Rescuers can become victims
How should you prepare with your fire department?
Give your fire department a tour of your silos. Show them the layout, access points and hazards, and ask what they would need from you in an emergency. Ask whether training is offered for your area.
Agree on the farm address, directions and a meeting point. Keep the plan in writing, and review it with family and workers.
Ask whether neighboring departments can be involved, since some silo incidents need more equipment than one station has.
- Show the department the layout and access
- Agree on the farm address and meeting point
- Ask about available training
Key takeaways
Sources and further reading
Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.