South Dakota trails · Limestone 100
Limestone 100
A 4.1-mile out-and-back in South Dakota, with 473 ft of climbing. Reaches Park Camp Spring. Managed by the U.S. Forest Service.
Elevation profile
Most of the climbing sits in the middle third — 58% of the ascent, between mile 1.4 and mile 2.7. It gives back about 297 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Park Camp Spring (spring)
Getting there
LIMESTONE 101 access. 44.29095, -103.92717 · directions
Daylight at the trailhead
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 5:47 a.m., the sun rises at 6:17 a.m. and sets at 7:34 p.m., and the last usable light fades about 8:04 p.m. (MDT) — 13 h 17 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 8.1-mile round trip takes roughly 3 h 29 min, so leaving the trailhead at sunrise puts you back around 9:45 a.m. — 9 h 48 min before sunset.
Loop options
- LIMESTONE 100 + LIMESTONE 120 + LIMESTONE 119 — 3.9 mi loop, 493 ft gain
Nearby trails
- Rimrock — 4.0 mi
- Snow-4 — 4.2 mi
- Stageyard 150 — 4.2 mi
- Eagle Cliff Bratwurst — 4.4 mi