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USFSBoise National Forest · Idaho

Grayback Campground And Group Sites - Reserve

Grayback Campground is located 36 miles northeast of Boise, Idaho, just off scenic State Highway 21.
Sites0all reservable
Elev.3,993ft
Comf.May-Oct6 months
Max rigtents
Electricnonesites
From Boise1h02real road time
The honest read
Synthesized from
RIDB · Open-Meteo
OSM · OSRM
Updated 2026-05-27

At 3,993 ft, Grayback Campground And Group Sites - Reserve has a 6-month comfortable window (May-Oct). Winter nights average around 18°F, so the shoulder seasons turn cold fast. Within about 4 miles: 4 peaks, lake or river access.

The campground at a glance

01 · CHARACTER
QuietCoolRoomyShadeRV-fitReserv.

Reads strongest on cool nights and quiet. Softest on quiet.

Six axes, each scored relative to every other federal campground in the region: quiet (miles to a major road), cool (elevation), roomy (average site spacing), shade, RV-fit (longest rig), and how reservable it is. All six come from data, nothing hand-tuned.

When to go

02 · CLIMATE
JFMAMJJASOND
avg highavg lowfrost-freedriest · Jul
May-Oct
Comfortable window: nights stay above 35°F, days below 90°F.
85%
Of summer weekend-days are dry.
May 14
Last spring frost; first fall frost Oct 15.
57°F
Average July low. Bring a fleece.

Getting there

03 · ACCESS
01
Boise
39 mi
1h02
02
Idaho Falls
307 mi
5h12
03
Coeur d'Alene
376 mi
8h33
By drive time
Boise · 1h02Idaho Falls · 5h12Coeur d'Alene · 8h33Camp

Routed road time (OSRM). Nearest major highway 0.4 mi away.

What's within four miles

05 · TRAILS · PEAKS · WATER

Trails & Peaks

Trail segments
75
Peaks
4

Water & Access

Lake / river access
yes
To nearest major road
0.4 mi
Method

We synthesize public data layers: RIDB and Recreation.gov facility and site records, Open-Meteo climate normals, OpenStreetMap roads, trails, and water, OSRM drive times, and USGS elevation. We take no bookings, no ads, and no paid placements. Independence is the entire point.

Check availability on Recreation.gov →