Underworld Cluster
Underworld Cluster in Idaho has 9 bouldering routes across 8 difficulty grades.
- 9 routes
- V0 – V6
- Bouldering
Best time to visit Underworld Cluster
Best months: April–June and September–October. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.
Jan
35° / 17°
10 wet
Feb
39° / 21°
9 wet
Mar
51° / 27°
9 wet
Apr
59° / 33°
10 wet
May
68° / 39°
10 wet
Jun
78° / 46°
7 wet
Jul
89° / 53°
5 wet
Aug
88° / 52°
6 wet
Sep
77° / 43°
6 wet
Oct
62° / 34°
7 wet
Nov
47° / 24°
9 wet
Dec
35° / 18°
10 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Massacre Rocks Sp, ID, 1.1 mi away at 4,195 ft. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Underworld Cluster is a bouldering area within Massacre Rocks State Park in Idaho, managed by State Park and Recreation. It sits among several other climbing areas, including Olympic Cluster and Garden of the Gods, and the River Trail lies just 0.1 mile away. The cluster holds nine bouldering routes, all rated from V0 to V6 on the V scale. The easiest is Lino Thorax at V0, and the hardest is Kleos: Glory in War at V6. Cerberus runs V2-3, and Styx is V4. For timing, late spring and early fall are the most comfortable. Typical averages from a nearby weather station show May highs around 68°F and September highs around 77°F, while July and August average highs near 89°F. Pipeline Campground is about 6 miles away for an overnight stay.
Routes (9)
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