Frost Dates for Ft Ross, CA

Elevation: 34 m

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. February 26
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. December 27

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 March 25
First Fall Frost December 15

Hard Freeze (28°F)

Last Spring Hard Freeze January 29
First Fall Hard Freeze January 16
38.52°N, 123.24°W © OpenStreetMap

Growing Season

305 Days February 26 to December 27

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.
Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January57°49°42°
February59°50°42°
March59°50°42°
April60°52°43°
May62°54°45°
June66°56°46°
July66°57°48°
August67°58°50°
September67°58°48°
October66°57°47°
November61°53°44°
December57°49°42°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January8.3
February6.6
March5.5
April4.3
May2.8
June0.6
July0.3
August0.3
September0.6
October1.7
November5.0
December7.1

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 42m · Shortest: 9h 18m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:35 AM5:10 PM9h 36m
February7:11 AM5:44 PM10h 33m
March7:32 AM7:14 PM11h 42m
April6:43 AM7:44 PM13h 01m
May6:06 AM8:12 PM14h 06m
June5:53 AM8:33 PM14h 40m
July6:05 AM8:32 PM14h 26m
August6:32 AM8:02 PM13h 30m
September7:00 AM7:15 PM12h 14m
October7:29 AM6:27 PM10h 58m
November7:02 AM4:54 PM9h 52m
December7:29 AM4:48 PM9h 19m

Nearby Stations

Bodega 6 Wsw, CA January 1 - December 31 Occidental, CA January 29 - December 30 Graton, CAMarch 20 - November 13 Healdsburg, CA February 15 - December 2 Cloverdale, CA February 25 - December 3 Santa Rosa Sonoma Co AP, CA March 2 - November 20

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