Grimes Creek-Summit Flat (FR 397) in ID -- Free Camping & Overnight Parking in Idaho

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Grimes Creek-Summit Flat (FR 397) in ID

Boise NF, Idaho City Ranger District
4,818 ft
Maps
Overnight camping allowedRUTTED
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A 12.5-mile stretch of dirt National Forest road in Boise County, ID. The road serves Grimes Monument.

Boise National Forest, Idaho City Ranger District allows dispersed camping here -- 14-day limit in any 30 days.

All 12.5 miles in are maintained only for high-clearance vehicles. Dirt the whole way in (12.5 miles). Climbs 2,800 ft over 12.5 miles -- sustained grades near 12%, with pitches to 18%. Stretches run along a shelf with a drop of up to ~130 ft on the downhill side. Winds through 12 switchbacks.

Jackson Peak stands 2,522 ft above the site, 3.3 miles east. The nearest town, Robie Creek, is 26 mi off.

September normals 40–75°F, 0.8″ rain. Monthly averages, PRISM 1991–2020.

Nearby Spots
Lava Mountain (FR 222) in IDDispersed Camping34.2miFR 117 — Lava Mountain in IDDispersed Camping35.7miLoop 189D in IDDispersed Camping36.4miSmith Creek (FR 175) in IDForest Road Road36.6miFR 175G4, Boise in IDDispersed Camping36.9mi
Fire restrictions

Set by Boise National Forest, Idaho City Ranger District. Stage 1 and 2 orders change within days -- check the current order before you build a fire.

fs.usda.gov
Sources checked August 2026Something wrong here?