9
Pull-thru
USACEStillhouse Hollow Lake · Texas
Union Grove
Overview Union Grove Park is located on the southwestern shore of Stillhouse Hollow Lake in central Texas.
Sites4038 reservable
Elev.666ft
Comf.Jan-Dec9 months
Max rig85 ft9 pull-thru
Electric4037×50-amp
From Austin1h09real 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 666 ft, Union Grove has a 9-month comfortable window (Jan-Dec). Winter nights average around 43°F, so the shoulder seasons turn cold fast. 40 sites total: 38 reservable and 2 first-come, first-served. Of the sites, 9 pull-through, 37 with 50-amp, and the longest takes a 85-ft rig. Within about 4 miles: 2 peaks, lake or river access.
The campground at a glance
01 · CHARACTER
Reads strongest on reservability and shade. 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 · Aug
Jan-Dec
Comfortable window: nights stay above 35°F, days below 90°F.
85%
Of summer weekend-days are dry.
Feb 25
Last spring frost; first fall frost Dec 3.
77°F
Average July low.
Getting there
03 · ACCESS
01
Austin
60 mi
1h09
02
San Antonio
138 mi
2h36
03
Dallas
150 mi
2h40
04
Houston
196 mi
3h52
By drive time
Routed road time (OSRM). Nearest major highway 4.5 mi away.
Picking your site
04 · 40 SITES
Color byShow only
40 mapped sites · dot color = seclusion · click a dot for details. Basemap © OpenStreetMap.
0
Walk-in
37
50-amp
0
Accessible
0
Prime
40
Sites
★ The standout
Site 26
THIR.
To neighbor
186 ft
Max rig
73 ft
Type
Standard
What's within four miles
05 · TRAILS · PEAKS · WATER
Trails & Peaks
Trail segments
238
Peaks
2
Water & Access
Lake / river access
yes
To nearest major road
4.5 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.