what zone is grass valley ca
Zip code 95949, Grass Valley CA is in USDA Hardiness Zone 9a: 20F to 25F. Using updated climate data through 2010, 95949 is in the Plantmaps Hardiness Zone 8a: 10F to 15F. The average first frost in 95949 is between November 1 - 10, while the average last frost occurs between April 11 - 20. 95949 is part of Ecoregion.ip code 95949, Grass Valley CA is in USDA Hardiness Zone 9a: 20F to 25F. Using updated climate data through 2010, 95949 is in the Plantmaps Hardiness Zone 8a: 10F to 15F. The average first frost in 95949 is between November 1 - 10, while the average last frost occurs between April 11 - 20. 95949 is part of Ecoregion.