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Re-Entry Intervals Explained

After a pesticide is applied, people should stay out of the area for a set time. That time is written on the label, and this guide explains how to find it and why it matters.

What is a re-entry interval?

A re-entry interval, often called a restricted-entry interval or REI, is the time after an application during which workers and others should not enter a treated area without the required protective equipment, or at all. It appears on the product label.

Intervals are set for each product and can differ depending on the crop and activity. This site does not list any, since you need the label for your product.

Some labels give different intervals for different crops or activities, and a few labels describe longer intervals for certain tasks such as hand harvesting. Read the entry that matches the actual task people will perform.

• Check the label for the interval.
• Confirm which activity it covers.
• Ask before guessing.

Where do I find the interval?

Look in the agricultural use requirements portion of the label, often boxed in the directions for use. Some labels list more than one interval depending on the setting or the task.

If the label is unclear, ask your state agency or extension office before sending anyone in. Treat uncertainty as a reason to wait.

Employees may be tempted to enter early because work is behind schedule. Make it clear that the interval is not negotiable and that nobody will be penalized for waiting.

Why does the interval matter?

Residues on leaves, soil and air can expose people who touch plants, work close to the surface or breathe vapors. Workers in hand labor tasks such as pruning, thinning and harvesting may have more contact than others.

Skin contact and breathing exposure may not cause immediate symptoms, so a feeling of being fine does not show that it is safe to go in early.

Heat can make the situation worse, because people sweat and may remove protective gear. Plan labor with the interval in mind and use cooler hours when permitted. Greenhouses, tunnels and other enclosed spaces may have different rules and additional ventilation statements on the label. Read those parts with care before anyone goes in.

• Do not enter early for convenience.
• Treat the interval as a minimum.
• Check conditions, such as ventilation in greenhouses, as the label directs.
• Keep children and animals out too.

What are an employer's duties?

Under federal worker protection rules and many state laws, employers have duties about telling workers, posting notices and providing training and decontamination supplies. Details depend on the setting and the product. Ask your state lead agency for what applies.

Even where a worker is a family member, the safe practice is to follow the same approach and share the information.

What about early entry?

The rules allow limited early entry in some cases, with specific protective equipment and conditions. These are narrow exceptions set out in regulations and labels, and require training. Do not treat them as a routine option.

If an emergency requires someone to enter, call for advice from your state agency and follow official guidance.

Do not send a worker into a treated field to retrieve equipment or turn off an irrigation line without checking the label and the rules. Plan these tasks before you spray.

• Early entry is a narrow exception.
• Training and protective equipment are required.
• Call your state agency if unsure.

How do I communicate the interval to workers?

Tell workers directly, in a language they understand, what was applied, where and when they may return. Post signs as required. Mark treated fields clearly and keep a record.

Check that signs are removed or updated when the interval ends so that they stay trustworthy.

Use pictures and clear words on signs and in training. A worker who cannot read the sign cannot follow it, so confirm that signs are in the languages your crew uses. Keep a notice board near the entrance to the farm or packing area with the field, product, date and earliest re-entry time. Update it daily during busy weeks.

What if a worker enters too early and feels ill?

Move the person away from the area, remove contaminated clothing and follow the first aid statements on the label. Call 911 in an emergency, and contact poison specialists for advice. Share the product name with medical staff.

Afterward, review what went wrong and how to prevent a repeat, without blaming individuals.

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