South Dakota trails · Snow-2K
Snow-2K
A 16.7-mile out-and-back in South Dakota, with 678 ft of climbing. Reaches Irey Spring. Managed by the U.S. Forest Service.
Elevation profile
Most of the climbing sits in the final third — 57% of the ascent, between mile 11.1 and mile 16.7. It gives back about 812 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Irey Spring (spring)
Getting there
SNOW-2K access. 44.11018, -103.89407 · 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 7:33 p.m., and the last usable light fades about 8:03 p.m. (MDT) — 13 h 16 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 33.4-mile round trip takes roughly 13 h 04 min, so leaving the trailhead at sunrise puts you back around 7:21 p.m. — 13 min before sunset.
Nearby trails
- Snow-5 — 5.6 mi
- Snow-2 — 7.3 mi
- Deerfield Lake Loop — 7.3 mi
- Eagle Cliff Bratwurst — 8.7 mi