Every summer, wildfires close Western highways — often with almost no warning. A fire jumps a ridge, smoke drops visibility to nothing, and a state DOT shuts a stretch of interstate that was clear an hour ago. If you drive the West between June and October, knowing how these closures work — and how to see them before you're parked in a miles-long backup — is worth a few minutes now.

Fires don't close roads until they do

A wildfire burning ten miles off the highway doesn't affect your drive at all — until the wind shifts. That's what makes fire closures different from a planned construction closure: they appear fast, they move, and the same fire can close more than one road as crews reposition. A closure isn't announced days ahead. It's issued the moment conditions demand it, and it can lift and re-close the same day.

Closures are announced by mile marker

When a state DOT closes a highway for fire or smoke, the closure is described by milepost: "I-84 closed eastbound between mileposts 216 and 224," not "closed near the mountains." That's how every DOT, dispatcher, and responder describes a location on the road. It's also why knowing your own mile marker matters when you're the one calling it in — if you're stopped at the back of a fire closure and need to report where you are, the marker is the answer that gets understood immediately.

How to check before you drive

Three habits save the most grief during fire season:

  • Check for closures on your specific route before you leave, not just the general area. A fire can close one highway and leave the parallel one open.
  • Watch for smoke, not just flames. Many fire closures are about visibility. If you can't see through it, don't drive into it — that's how chain-reaction crashes happen.
  • Know your mile marker as you go. If the road closes ahead of you or you need help, your position in mileposts is the fastest thing to report.

See every US fire — and the closures they cause — on one map

We built a free live map of every active wildfire in the country, straight from the National Interagency Fire Center, with acres and containment for each one. On the same map: the highway closures state DOTs have issued, so you can see whether a fire is actually sitting on a road you need. It updates every few minutes and needs no download.

Open the live fire map →

Why one map instead of fifty

Fire information and road information usually live in separate places: a national fire map here, each state's 511 closures there. During a fast-moving fire, flipping between them is exactly what you don't have time for. Putting active fires and DOT closures on one map answers the question drivers actually have — is this fire on my road? — in a single glance. It's the same idea behind the MileCheck app, which shows live DOT road alerts, including fire closures, tied to your exact position and mile marker as you drive.

If you're caught near a closure

Don't drive around barricades — they're there because officers know something you can't see. Note your mile marker, follow posted detours, and check live alerts before committing to an alternate route, because the obvious detour may be closed too. And if you're stopped and need to report your location to dispatch or a tow, lead with the road and the mile marker. It's the one piece of information that turns "somewhere on the highway near the fire" into an exact spot on the map.

Keep reading

State guides: Oregon  ·  Washington  ·  Montana  ·  Utah  ·  Arizona
Essentials: What to tell 911 on the highway  ·  How to find your mile marker  ·  All 50 states