3
Pull-thru
USFSManti-La Sal National Forest · Utah
Twelve Mile Flat
Overview Twelve Mile Flat Campground is located beneath the shadow of Mt.
Sites3011 reservable
Elev.10,118ft
Comf.Jun-Sep4 months
Max rig35 ft3 pull-thru
Electricnonesites
From Salt Lake City3h29real 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 10,118 ft, Twelve Mile Flat has a 4-month comfortable window (Jun-Sep). Winter nights average around 10°F, so the shoulder seasons turn cold fast. 30 sites total: 11 reservable and 19 first-come, first-served. Of the sites, 3 pull-through, and the longest takes a 35-ft rig. Within about 4 miles: 1 named hiking route, 9 peaks, lake or river access.
The campground at a glance
01 · CHARACTER
Reads strongest on cool nights and quiet. 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 · Sep
Jun-Sep
Comfortable window: nights stay above 35°F, days below 90°F.
76%
Of summer weekend-days are dry.
Jun 20
Last spring frost; first fall frost Sep 18.
49°F
Average July low. Bring a fleece.
Getting there
03 · ACCESS
01
Salt Lake City
156 mi
3h29
02
Moab
153 mi
3h42
03
St. George
222 mi
4h17
By drive time
Routed road time (OSRM). Nearest major highway 11.9 mi away.
Picking your site
04 · 30 SITES
Color byShow only
16 mapped sites · dot color = seclusion · click a dot for details. Basemap © OpenStreetMap.
0
Walk-in
0
50-amp
0
Accessible
0
Prime
30
Sites
★ The standout
Site 016
Main.
To neighbor
113 ft
Max rig
30 ft
Type
Standard
What's within four miles
05 · TRAILS · PEAKS · WATER
Trails & Peaks
Named hiking routes
1
Peaks
9
Water & Access
Lake / river access
yes
To nearest major road
11.9 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.