0
Pull-thru
USFSSawtooth National Forest · Idaho
Thompson Flat
Overview Thompson Flat Campground is located high in the Albion Mountain Range of southern Idaho, near the towns of Declo and Albion.
Sites1311 reservable
Elev.8,064ft
Comf.Jun-Sep4 months
Max rig60 ft
Electricnonesites
From Idaho Falls2h45real road time
The honest read
Synthesized from
RIDB · Open-Meteo
OSM · OSRM
Updated 2026-05-27
RIDB · Open-Meteo
OSM · OSRM
Updated 2026-05-27
At 8,064 ft, Thompson Flat has a 4-month comfortable window (Jun-Sep). Winter nights average around 14°F, so the shoulder seasons turn cold fast. 13 sites total: 11 reservable and 2 first-come, first-served. Within about 4 miles: 3 peaks, lake or river access.
The campground at a glance
01 · CHARACTER
Reads strongest on shade and reservability. Softest on roomy sites.
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
avg highavg lowfrost-freedriest · Jul
Jun-Sep
Comfortable window: nights stay above 35°F, days below 90°F.
82%
Of summer weekend-days are dry.
Jun 18
Last spring frost; first fall frost Sep 26.
58°F
Average July low. Bring a fleece.
Getting there
03 · ACCESS
01
Idaho Falls
142 mi
2h45
02
Boise
192 mi
3h33
03
Coeur d'Alene
616 mi
10h29
By drive time
Picking your site
04 · 13 SITES
Color byShow only
11 mapped sites · dot color = seclusion · click a dot for details. Basemap © OpenStreetMap.
0
Walk-in
0
50-amp
13
Accessible
0
Prime
13
Sites
★ The standout
Site 02
THOMPSON FLAT · shaded.
To neighbor
370 ft
Max rig
50 ft
Type
Standard
What's within four miles
05 · TRAILS · PEAKS · WATER
Trails & Peaks
Trail segments
24
Peaks
3
Water & Access
Lake / river access
yes
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.