Frost Dates for Penn Valley, CA

Based on data from Grass Valley #2 weather station, 7 miles away

Elevation: 1401 ft

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 10
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 13

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost April 18
First Fall Frost November 5

Hard Freeze (28°F)

Last Spring Hard Freeze March 9
First Fall Hard Freeze December 1
39.20°N, 121.19°W © OpenStreetMap

Growing Season

217 Days April 10 to November 13

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 9a

Avg. annual minimum: 20 to 25°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January54°43°33°
February55°45°34°
March58°48°37°
April63°51°40°
May71°59°47°
June80°66°53°
July88°73°58°
August87°72°57°
September82°67°52°
October72°58°44°
November60°48°37°
December53°43°33°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January12.6
February12.4
March13.5
April9.1
May6.7
June1.5
July0.0
August0.0
September0.0
October7.3
November10.7
December13.8

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 46m · Shortest: 9h 14m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:28 AM4:60 PM9h 32m
February7:03 AM5:34 PM10h 31m
March7:23 AM7:05 PM11h 42m
April6:33 AM7:36 PM13h 02m
May5:56 AM8:05 PM14h 09m
June5:42 AM8:27 PM14h 45m
July5:55 AM8:25 PM14h 30m
August6:22 AM7:55 PM13h 32m
September6:52 AM7:06 PM12h 14m
October7:21 AM6:18 PM10h 57m
November6:55 AM4:44 PM9h 48m
December7:23 AM4:38 PM9h 15m

Nearby Stations

Nevada City, CA April 14 - November 20 Colfax, CAApril 3 - November 24 Dobbins 1 S, CA April 1 - November 17 Blue Canyon AP, CA May 4 - November 4 Auburn, CA February 25 - December 5 Georgetown Rs, CA April 12 - November 21

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