Colorado · Rock climbing · Boulder

Mars Block

Mars Block in Colorado has 8 routes across 7 grades, offering sport and trad climbing.

8 routes
5.3 – 5.12d
Trad · Sport

Best time to visit Mars Block

Best months: May–September. 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.

  1. Jan

    39° / 17°

    5 wet

  2. Feb

    40° / 17°

    5 wet

  3. Mar

    47° / 22°

    6 wet

  4. Apr

    52° / 27°

    8 wet

  5. May

    61° / 35°

    10 wet

  6. Jun

    73° / 44°

    9 wet

  7. Jul

    79° / 50°

    10 wet

  8. Aug

    77° / 48°

    11 wet

  9. Sep

    70° / 41°

    8 wet

  10. Oct

    57° / 31°

    6 wet

  11. Nov

    47° / 24°

    5 wet

  12. Dec

    40° / 17°

    5 wet

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Gross Rsvr, CO, 3.7 mi away at 7,970 ft. The station sits about 500 ft higher than this place, so expect it a little warmer here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Mars Block is a climbing area on city land in Colorado, about 0.1 mile from the nearby climbing areas of Nebel Horn Ridge and East Ridge. It sits in a cluster of bouldering and ridge routes that also includes the Bear Peak Trail, a hike about 0.4 mile away, and the Mesa Trail, roughly 0.6 mile off. Summer is the most comfortable time to go. Typical averages from a nearby weather station show July highs around 79°F with lows near 50°F, while winter highs sit in the low to mid 40s and lows drop to about 17°F. For more time outdoors, Boulder Creek offers canoeing about 3.3 miles away, and Winiger Ridge campground is about 4.4 miles off.

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