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Silo Entry Safety Procedures

Entering a silo is among the riskier jobs on a farm. This guide explains why it is treated as confined space work and what planning means in principle, without giving step-by-step instructions.

Why is a silo a confined space?

A silo has limited openings, can have air that is unsafe to breathe, and can contain materials that shift or collapse. It was not designed for people to work in comfortably. Those features meet the general definition of a confined space used by safety agencies.

OSHA and NIOSH describe what a confined space is and what employers must do. Confirm what applies to your farm with them or your state safety office.

Employers and farm owners carry responsibility for making sure that anyone who enters is trained and prepared. Where employees are involved, official rules are likely to apply.

• Limited openings and ways out
• Air that may be unsafe
• Material that can shift or collapse

When is entry needed at all?

Many farms try to avoid entry by using equipment that works from outside, by planning repairs and cleanouts carefully and by hiring trained contractors for work that really requires going inside.

Before deciding to enter, ask whether the job can be done another way. An experienced advisor from extension or the equipment company may know options you have not considered.

A contractor who enters silos regularly may have equipment, training and insurance that a farm does not. Consider hiring one.

• Hire a trained contractor if the job needs entry
• Use tools that work from outside
• Plan repairs so entry is rare

What does planning look like?

A good plan covers who will enter, why, how long they will be inside, how the air will be checked, how equipment will be controlled and how help will be summoned. It is written, shared and understood by everyone before work starts.

The details of each element depend on the structure and on official standards. Take them from OSHA, NIOSH and trained instructors, and from your equipment manuals.

The plan should also name who calls for help and what information they will give, including the farm address and how to reach the silo.

• Written plan shared with everyone
• Equipment controlled and secured
• Air checked by a trained person
• Outside watcher who can call 911

Why does the air matter?

Silo atmospheres can be unsafe in ways you cannot see or smell. Testing needs the right instruments, calibrated and used by someone trained, and conditions can change while work is under way.

Never enter because the air seems fine. Official guidance explains the testing process, and recognized training providers can teach it.

Good communication can be as simple as an agreed signal or a radio, but the method must be tested before entry.

• Testing needs calibrated instruments
• Trained people must read the results
• Conditions can change during work
• Never rely on smell or feel

What is the role of the person outside?

A trained observer stays outside the entire time, keeps contact with the person inside and is ready to call 911. They must not go in, even if the person inside stops responding.

Many deaths in confined spaces involve a would-be rescuer. The observer's discipline is part of the safety system.

Practice what you would do if the person inside stops responding, which is to call 911 and stay outside.

• Stays outside at all times
• Keeps contact with the person inside
• Calls 911 if there is any problem
• Never enters to rescue

What about the unloading equipment and the silage?

Silage can shift, collapse or form a crust. Unloading equipment can start unexpectedly. Both need controls so that nobody is exposed to moving material or machinery.

Lockout practices and equipment-specific procedures come from manuals and official guidance. If you are not sure how to secure your equipment, stop and ask.

Review the plan after each entry and update it. Small lessons learned can prevent a future incident.

• Lock out and secure unloading equipment
• Watch for crusted or shifting silage
• Do not stand under unstable material

Where do you find training and official requirements?

OSHA, NIOSH and many land-grant university programs publish confined space information for agriculture. Hands-on courses are offered in some regions through extension and safety organizations.

Rules vary by state and by type of employer. Contact the official agency to confirm what applies to your operation. In an emergency, call 911 and do not attempt a rescue yourself.

Keep copies of your plans and training records. They are useful when talking with insurers and officials.

• OSHA and NIOSH confined space pages
• Extension hands-on courses
• State occupational safety offices

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