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© 2026 Roaming.Camp · Data from NPS, Recreation.gov, BLM, USFS, NWS, and the FCC.Operating on ceded ancestral land.Photography via Unsplash.

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Trinity Peak Boise National Forest

Hike

Rainbow Basin

Passes Big Trinity Lake
Inside Boise National Forest
2,721 ft of climbing

8.9 mi out & back · 2,721 ft gain · 8,458 ft high point · Hard

In Boise National Forest · Idaho · U.S. Forest Service

About Elevation Highlights Map Camp near here More hikes

About this hike

Rainbow Basin spans 8.9 miles out and back in Boise National Forest, passing Big Trinity Lake and near Trinity Mountain and Lookout.

Elevation

2,721 ft of gain round trip.

Camp near here

The closest places to sleep, measured from the trailhead.

See all on the map

0.6 mi from the trailhead
Big Trinity Cabin
Campground · Idaho

More hikes nearby

Ranked the same way, within twenty-five miles.

24 mi from you
Scenic Lake
- Ends at Scenic Lake
- Inside Boise National Forest
- 4,097 ft of climbing
19.3 mi out & back · 4,097 ft gain · Very hard
Boise National Forest · Camp 4 mi away

Out: 1,510 ft up, returns the same way. Source: USGS 3DEP.

Highlights

What the trail reaches, measured from the start.

Big Trinity LakeAlong the way · 0.1 mi in
Little Trinity LakeNearby · 0.0 mi in
Fiddle LakeNearby · 1.7 mi in
Trinity MountainNearby · 2.3 mi in
Trinity LookoutNearby · 2.3 mi in

Nearby reading

Trinity Mountain (Idaho)

Map

The route at the trailhead. Drag with two fingers, or hold a key to zoom.

Trail data: USFS, NPS, © OpenStreetMap contributors (ODbL). Elevation: USGS 3DEP via Mapzen terrain tiles. Nearby reading: Wikipedia. Photos: Wikimedia Commons contributors, licensed as shown on each photo. Download the trail and feature data.

At a glance

Length: 8.9 mi
Shape: Out & back
Gain: 2,721 ft round trip
High point: 8,458 ft
Low point: 7,769 ft
Difficulty: HardFrom 8.9 mi and 2,721 ft of climbing
Managed by: U.S. Forest Service
State: Idaho
Camps within 15 mi: 10
Trailhead: 43.6253° N · 115.4255° W

Get directions Open the map

1.0 mi from the trailhead

Big Roaring River Lake Campground

Campground · Idaho

2.5 mi from the trailhead

Trinity Warming Hut

Cabin & lookout · Idaho

25 mi from you

Perkins Creek

Ends at Perkons Lake
Inside Sawtooth National Forest
2,531 ft of climbing

5.3 mi out & back · 2,531 ft gain · Very hard

Sawtooth National Forest · Camp 5 mi away

Fiddle Lake

Ends at Fiddle Lake
Inside Boise National Forest
1,218 ft of climbing

4.0 mi out & back · 1,218 ft gain · Moderate

Boise National Forest · Camp under a mile away

Big Lookout Lake

Ends at Fiddle Lake
Inside Boise National Forest
1,107 ft of climbing

3.9 mi out & back · 1,107 ft gain · Moderate

Boise National Forest · Camp under a mile away

Little Lookout Lake

Ends at Fiddle Lake
Inside Boise National Forest
1,062 ft of climbing

3.5 mi out & back · 1,062 ft gain · Moderate

Boise National Forest · Camp under a mile away

Middle Rainbow Lake

Passes Big Trinity Lake
Inside Boise National Forest
1,877 ft of climbing

6.4 mi out & back · 1,877 ft gain · Hard

Boise National Forest · Camp under a mile away

More like this

Hikes that read like this one, wherever they are.

Big Rainbow Lake
- Passes Big Trinity Lake
- Inside Boise National Forest
- 1,708 ft of climbing
6.0 mi out & back · 1,708 ft gain · Hard
Boise National Forest · Camp under a mile away
Middle Rainbow Lake
- Passes Big Trinity Lake
- Inside Boise National Forest
- 1,877 ft of climbing
6.4 mi out & back · 1,877 ft gain · Hard
Boise National Forest · Camp under a mile away
Heart Lake
- Passes Big Trinity Lake
- Inside Boise National Forest
- 1,602 ft of climbing
5.4 mi out & back · 1,602 ft gain · Hard
Boise National Forest · Camp under a mile away
Rainbow Lake
- Ends at Rainbow Lake
- Inside Boise National Forest
3.7 mi out & back · 640 ft gain · Moderate
Boise National Forest · Camp 7 mi away

Weather

7-day forecast

Sun33°23°Widespread Snow Showers
Mon37°24°Sunny
Tue39°24°Partly Sunny
Wed35°22°Mostly Sunny
Thu35°21°Mostly Sunny
Fri33°20°Slight Chance Snow Showers
Sat37°Mostly Sunny

Sun: Widespread Snow Showers · wind 6 to 15 mph NNE

National Weather Service · refreshed hourly

Signal

Cell coverage here

No carrier reports signal at this spot.

FCC coverage data · signal varies in remote terrain