What is the Idaho speed limit?

I’m planning a trip out West and Idaho is at the top of my list of places to visit. My only issue is that I’m on a time crunch and I want to get to my destinations as fast as possible. What is the speed limit in Idaho?

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Answer provided by
Eric Schad
Answered on Jun 22, 2022
If you want to hit all of your destinations safely and without getting a ticket, the Idaho speed limit is 80 mph. This speed limit ties the state for the highest speed limit in the country, but this mostly applies to sparsely populated and rural areas.
If you’re traveling in other areas of Idaho, make sure to observe these speed limits if none are posted:
  • 65 mph on most state highways
  • 55 mph on roads that aren’t state highways or the interstate (unless otherwise posted)
  • 35 mph in business districts and residential areas
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