Seasonal closures · Idaho

Which roads close for winter in Idaho?

1 road in Idaho closes for the winter on a schedule the agency publishes. Each page below shows what the 511 Idaho feed is posting for that route right now and quotes the closing and reopening dates from the agency's own page. The dates move with the snow. Storm closures on roads that stay open all winter are on the Idaho road conditions page.

SH-21

Is Idaho 21 over Banner Summit open?

Closes when avalanche danger is high, with no fixed dates. Reopens once the snow settles.

How to read these pages

A seasonal closure is a gate the agency locks for the winter, not a storm closure. 511 Idaho posts storm closures and chain rules in its feed, and those show on the Idaho road conditions page. A seasonal gate is announced on the agency's page and sometimes in the feed too. Each road page reads the feed for its route and lists whatever is posted, and says plainly when nothing is.

Closing dates in these pages are the ones the agency gives, with the date MileCheck read them. None of them is a prediction. When an agency has not posted dates for the 2026-27 winter, the page says that.

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