Illinois trails · Thacker Hollow
Thacker Hollow
A 6.0-mile out-and-back in Illinois, with 305 ft of climbing. Managed by the U.S. Forest Service.
Elevation profile
Most of the climbing sits in the final third — 55% of the ascent, between mile 4.0 and mile 6.0. It gives back about 304 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Heads up
Daylight at the trailhead
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 5:55 a.m., the sun rises at 6:22 a.m. and sets at 7:24 p.m., and the last usable light fades about 7:50 p.m. (CDT) — 13 h 02 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 11.9-mile round trip takes roughly 4 h 43 min, so leaving the trailhead at sunrise puts you back around 11:05 a.m. — 8 h 19 min before sunset.
Loop options
- 151 + 150 + THACKER HOLLOW — 4.2 mi loop, 567 ft gain
- 150 + THACKER HOLLOW + TWINKIE — 5.1 mi loop, 602 ft gain
- MEMORIAL + TWINKIE + THACKER HOLLOW — 5.8 mi loop, 321 ft gain
Nearby trails
- Grindstaff Trail — 0.7 mi
- R-R Garden Of The Gods Loop — 3.0 mi
- Pounds Ridge — 3.1 mi
- Beaver Trail — 4.1 mi