California · Rock climbing · Saratoga

Lyme Disease Rock

Lyme Disease Rock in California has 9 sport climbing routes across 7 grades.

Photo: npdoty, CC BY 2.0 (via Flickr)

9 routes

5.7 – 5.11c/d

Sport

Best time to visit Lyme Disease Rock

Best months: April–November. 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
55° / 41°
14 wet
Feb
55° / 40°
14 wet
Mar
58° / 41°
13 wet
Apr
62° / 43°
10 wet
May
67° / 47°
7 wet
Jun
75° / 52°
3 wet
Jul
81° / 58°
1 wet
Aug
81° / 59°
1 wet
Sep
79° / 57°
2 wet
Oct
71° / 52°
6 wet
Nov
60° / 44°
11 wet
Dec
54° / 40°
15 wet

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Skyline Ridge Preserve, CA, 7.9 mi away at 2,270 ft. The station sits about 800 ft lower than this place, so expect it a little cooler here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Lyme Disease Rock is a climbing area in Sanborn County Park, on county land in California. It sits among a cluster of other climbing spots and trails, with Yabo Zone, Dog Dish Boulders and Mrs Magoo Boulder all about 0.2 miles away, and Castle Rock Trail about the same distance. The area is a sport climbing destination. Nine routes are listed, all rated from 5.7 to 5.11c/d. Cosgrove Face, the hardest of them, was first climbed by Scott Cosgrove in 1991. Bitch Goddess Right and Pigs' Feat are both 5.10a, and Lucky in Love is 5.11b. Summer is the driest and warmest stretch. Typical averages from a nearby weather station show July and August highs around 81°F with only about one wet day a month, while winter brings highs in the mid-50s and rain on roughly 14 days a month. That station sits about 800 feet lower than the park, so temperatures at Lyme Disease Rock run cooler.