Idaho Headlight & Wiper Law
Idaho has no separate 'wipers on, lights on' statute, but you still need headlights in rain or snow. Weather heavy enough to run the wipers almost always drops visibility under the 500-foot line, and that trips the general rule on its own (Idaho Code 49-903). Sunset to sunrise, lights on. 'Lights' means low beams and full headlamps, not DRLs, so your tail lamps actually show.
When you light up in Idaho
Idaho has no separate 'wipers on, lights on' statute, but you still need headlights in rain or snow. Weather heavy enough to run the wipers almost always drops visibility under the 500-foot line, and that trips the general rule on its own (Idaho Code 49-903). Sunset to sunrise, lights on. 'Lights' means low beams and full headlamps, not DRLs, so your tail lamps actually show.
Night, low visibility, and daytime
- Sunset to sunrise, and any time there isn't enough light to clearly see persons and vehicles 500 feet ahead (Idaho Code 49-903). No half-hour buffer in the statute.
- No statewide work-zone daytime-headlight mandate; obey any posted 'Headlights On' stretch on mountain passes, where the sign is its own duty. DRLs aren't required and don't satisfy 49-903 — DRL and 'AUTO' modes leave your tail and marker lamps dark. Turn the switch fully to ON, low beam.
Idaho Headlight Law FAQ
Do you need headlights when using wipers in Idaho?
When are headlights required in Idaho?
What is the headlight fine in Idaho?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://legislature.idaho.gov/statutesrules/idstat/title49/t49ch9/sect49-903/. See our Terms & Disclaimer.
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