The OSHA wind speed limit for aerial lifts is not a single number. Federal regulations require you to follow the manufacturer’s maximum wind rating for your specific machine, which typically falls between 20 and 28 mph for boom lifts and outdoor-rated scissor lifts. A separate 20 mph rule exists in the OSHA regulations, but it applies only to personnel platforms hoisted by cranes, not to self-propelled boom or scissor lifts.
Why OSHA Doesn’t Set One Number
OSHA’s aerial lift fact sheet tells operators not to use a lift “in high winds above those recommended by the manufacturer” rather than naming a threshold.1Occupational Safety and Health Administration. Aerial Lifts Fact Sheet The wording is intentional. A compact scissor lift working at 15 feet has a completely different wind profile than a 135-foot articulating boom fully extended on open ground. A single number would either be dangerously high for the boom or pointlessly restrictive for the scissor lift.
Boom length, platform height, platform area, load weight, outrigger deployment, and ground slope all change how wind acts on the machine. Because those variables shift from lift to lift and site to site, OSHA pushes the wind-speed decision down to the manufacturer’s engineering data and the judgment of the people on site.
Your Binding Limit Is on the Machine
The operating manual and the decals on the platform contain the wind speed limit for your specific aerial lift. Under 29 CFR 1926.453, aerial lifts must be designed and constructed to meet the applicable ANSI standards, and boom and basket load limits specified by the manufacturer cannot be exceeded.2eCFR. 29 CFR 1926.453 – Aerial Lifts Exceeding the manufacturer’s wind rating exposes the employer to a General Duty Clause violation even though the regulation itself does not print a wind number.
Most boom lift manufacturers set their wind limit somewhere between 20 and 28 mph. Under the current ANSI A92 family of standards, scissor lifts designed for outdoor use must pass stability testing at wind speeds up to 28 mph and are rated accordingly. Scissor lifts rated at 0 mph wind are indoor-only machines. A scissor lift with a 0 mph wind rating in use outside on a breezy day is a violation waiting to happen, no matter how calm the ground feels.
The number varies by model. Two boom lifts sitting on the same lot from two different manufacturers can carry different wind ratings. Check the manual or the decal on the platform. Relying on a coworker’s memory or a rule of thumb from a previous job is one of the most common ways this goes wrong.
The 20 MPH Rule Applies Only to Crane-Hoisted Platforms
There is a specific federal wind speed number in the OSHA regulations, but it applies to a narrower situation than many people assume. Under 29 CFR 1926.1431, when a crane hoists a personnel platform, a qualified person must evaluate whether it is safe to continue once wind speed, sustained or gusts, exceeds 20 mph at the platform. If the qualified person determines conditions are unsafe, the operation must stop immediately.3eCFR. 29 CFR 1926.1431 – Hoisting Personnel
This rule covers situations where a crane picks up a work basket with people inside. It does not govern self-propelled aerial lifts like boom lifts, scissor lifts, or truck-mounted platforms. Those machines fall under 1926.453, which defers to manufacturer limits rather than setting a numerical threshold.
Many training materials and safety talks cite “20 mph” as though it were a blanket OSHA rule for every aerial lift on every job. It isn’t. Using 20 mph as a conservative internal policy is perfectly reasonable, but treating a crane-specific regulation as the aerial lift standard leads to misplaced confidence on one end or unnecessary shutdowns on the other.
The General Duty Clause Can Lower the Ceiling
Even when wind is technically below the manufacturer’s rating, an employer can still be cited for allowing work in unsafe conditions. Section 5(a)(1) of the OSH Act requires every employer to provide a workplace “free from recognized hazards that are causing or are likely to cause death or serious physical harm.”4Occupational Safety and Health Administration. OSH Act of 1970 – Section 5 Duties Wind that threatens a lift’s stability is a recognized hazard.
OSHA’s construction standards define a “competent person” as someone capable of identifying existing and predictable hazards and authorized to take prompt corrective action. On a site with aerial lifts, the competent person is responsible for evaluating changing weather, including wind, and grounding lifts when conditions deteriorate. That authority is not optional. If a competent person sees conditions turning dangerous and does nothing, the employer bears the liability.
This is where most enforcement actions actually bite. The manufacturer’s rating gives you a ceiling, but the General Duty Clause can bring that ceiling down based on real conditions. Gusts well above the sustained speed, sudden directional shifts, or a platform loaded with plywood acting as a sail can all make conditions unsafe at wind speeds the machine was theoretically rated to handle.
Measure Wind at Platform Height, Not on the Ground
Wind speed increases with height. As a rough guide, wind at 100 feet above open ground can run 30 to 50 percent stronger than wind measured at 10 feet. If a ground-level weather app reads 15 mph, the platform at 80 feet could be seeing 20 or more. This gap catches people off guard constantly.
An anemometer mounted on or near the personnel platform gives the most relevant reading. A handheld anemometer carried by the operator is a practical alternative for lifts that move between locations. Ground-level weather readings understate the actual exposure at working height and should not be the number a go/no-go decision is based on.
Site Conditions That Make the Rated Number Misleading
Ambient wind is only part of the picture. Site conditions can concentrate wind in ways that make an anemometer reading dangerously misleading if you measure in the wrong place.
The Venturi effect, where wind accelerates as it squeezes through a narrow gap, is common on sites with adjacent buildings, walls, or large equipment. Wind funneled between two structures can increase dramatically compared to the open-air reading. The top of a steep slope can see wind speeds increased by as much as 70 percent above what is measured on flat ground nearby. Abrupt differences in building heights also create strong local downdrafts that can shove a platform sideways without warning.
Then there is the sail effect. A bare platform has a certain wind profile, but attach tarps, signage, or plywood sheets, and the effective wind-catching area increases substantially. Manufacturers test their machines with a standard platform configuration. Anything added beyond that changes the equation in ways the rating does not account for.
Gusts deserve separate attention. A sustained wind of 15 mph with gusts to 28 mph is not a 15 mph day for aerial lift purposes. The gust is the number that can tip the machine. Weather reports often list sustained speed prominently and bury gust data in the details, so operators need to look at both before making a call.
Penalties for Getting It Wrong
Operating an aerial lift in wind conditions that violate manufacturer specifications or the General Duty Clause exposes employers to OSHA citations. As of the most recent adjustment effective January 2025, a serious violation carries a maximum penalty of $16,550 per violation, while a willful or repeated violation can reach $165,514 per violation.5Occupational Safety and Health Administration. OSHA Penalties These figures are adjusted annually for inflation.
A single wind-related incident can generate multiple citations. An employer might be cited for failing to follow manufacturer instructions, failing to have a competent person on site, failing to train the operator, and violating the General Duty Clause, each carrying its own penalty. When the incident involves a fatality or serious injury, OSHA frequently classifies violations as willful if the employer had reason to know conditions were dangerous and proceeded anyway. Stacked across multiple citations at over $165,000 per willful violation, the financial exposure adds up fast.
Practical Stop-Work Checklist
- Verify the manufacturer’s maximum wind speed for your specific model before the lift goes up. Do not assume it matches a different machine you used last week.
- Measure at or near working height with an anemometer, not at ground level.
- Monitor continuously. A morning check is not enough; weather apps with gust alerts or an anemometer with an alarm help the competent person stay ahead of shifting conditions.
- If the platform is carrying tarps, signage, or large flat materials, treat the effective wind speed as higher than the instrument reads and ground the lift earlier.
- Position lifts away from gaps between buildings, slopes, ridgelines, and corners of large structures where wind concentrates.
- Consider an internal stop-work threshold below the manufacturer’s rating to absorb gusts and site factors. Many contractors use 20 mph sustained regardless of what the machine is rated for.
- Log wind readings, stop-work decisions, and the competent person’s assessments. If OSHA investigates after an incident, documentation is what separates a defensible decision from a negligent one.