I-90 Wyoming Road Conditions

I-90 crosses 208 miles of Wyoming, between the South Dakota line and the Montana line. That is 7% of I-90's 3,020 miles.

By mile marker, I-90 passes Gillette 127. It is the only city on this stretch that the mileposts name.

No full closures are reported on I-90 in Wyoming as of Oct 8, 2026 9:33 PM MDT, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.

Towns Along I-90 in Wyoming

From Ranchester to Sundance, with the position of each town measured along this stretch itself — counted from the Ranchester end, not from a state milepost, so it will not match the numbers on the signs.

1. 9 mi Ranchester
2. 25 mi Sheridan 1.4 mi off the road
3. 59 mi Buffalo 2.8 mi off the road
4. 127 mi Gillette
5. 155 mi Moorcroft
6. 189 mi Sundance

Places from the US Census Gazetteer and population estimates, both public domain; distances measured along this page's own route geometry.

Wyoming Chain Law & Wind Closures

Wyoming has a chain law like its neighbors, and then it has the wind. WYDOT closes highways to light, high-profile vehicles when gusts get up — an RV, a camper, a moving van, an empty box trailer — and ignoring that closure is a misdemeanor, not a ticket.

The two chain law levels

Both levels are satisfied by tire chains. What else counts depends on the level, and Wyoming asks for the drivetrain and the tires together at Level 2 where Level 1 takes either on its own.

Level 1

Tire chains, or adequate snow tires, or an all-wheel drive vehicle. Any one of the three.

Level 2

Tire chains, or an all-wheel drive vehicle on adequate mud and snow or all-weather rated tires — the drivetrain alone is no longer enough. Commercial vehicles need chains on at least two drive wheels, at opposite ends of the same drive axle.

Fines

Non-compliance is a $250 fine, or $750 where the violation closes the highway.

Wind closures and light, high-profile vehicles

WYDOT closes highways to light, high-profile vehicles — RVs, campers, moving vans, utility trailers and other tall boxy loads — when the wind threatens to blow them over, and the signs now name a weight threshold rather than a list of vehicle types, because WYDOT says it is still working on the definition. Where gusts reach 60 mph and there is no sign available to post a closure, WYDOT publishes the road as an extreme blow over risk instead. Driving past a closure is a misdemeanor: a $1,000 fine and up to 30 days, rising to $2,500 for another offense within three years — four times what the chain law costs, and the reason this is the rule to check in Wyoming.

How you will know it is active

• Variable message signs, which carry the weight threshold in force
• WYOROAD at wyoroad.info, and 511 by phone
• WYDOT's road and travel condition reports, per segment

Chain law levels and wind closures are WYDOT's to impose and they move with the storm and the gusts. This page does not carry them — WYOROAD ↗ is the authority before you set off.

Source: WYDOT, checked August 26, 2026.

Related Roads

I-90 in Wyoming Road Weather FAQ

Is Interstate 90 in Wyoming closed right now?

No full closures are reported on I-90 in Wyoming. No lane closures or roadworks are reported either.

What are I-90 in Wyoming road conditions today?

The map on this page colors the route along I-90 in Wyoming by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Oct 8, 2026 9:33 PM MDT. Right now temperatures run from 57°F to 63°F and the strongest wind is 7 mph.

What is the Wyoming chain law?

Both levels are satisfied by tire chains. What else counts depends on the level, and Wyoming asks for the drivetrain and the tires together at Level 2 where Level 1 takes either on its own.

How much is the fine for ignoring a Wyoming travel restriction?

Non-compliance is a $250 fine, or $750 where the violation closes the highway.

Do I need chains to drive I-90 in Wyoming in winter?

Not always. It depends which of 2 requirements is posted: "Level 1" — tire chains, or adequate snow tires, or an all-wheel drive vehicle. Any one of the three. "Level 2" — tire chains, or an all-wheel drive vehicle on adequate mud and snow or all-weather rated tires — the drivetrain alone is no longer enough. Commercial vehicles need chains on at least two drive wheels, at opposite ends of the same drive axle.

What does "closed to light, high-profile vehicles" mean in Wyoming?

WYDOT closes highways to light, high-profile vehicles — RVs, campers, moving vans, utility trailers and other tall boxy loads — when the wind threatens to blow them over, and the signs now name a weight threshold rather than a list of vehicle types, because WYDOT says it is still working on the definition. Where gusts reach 60 mph and there is no sign available to post a closure, WYDOT publishes the road as an extreme blow over risk instead. Driving past a closure is a misdemeanor: a $1,000 fine and up to 30 days, rising to $2,500 for another offense within three years — four times what the chain law costs, and the reason this is the rule to check in Wyoming.

How often are I-90 in Wyoming road conditions updated?

The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.