Frost Dates for Sonoma, CA

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 2
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 27
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 13
First Fall Frost November 18

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze January 20
First Fall Hard Freeze December 14
38.30°N, -122.46°W © OpenStreetMap

Growing Season

270 Days March 2 to November 27

USDA Hardiness Zone iHardiness 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 9b

Learn more

Temperature

30° 50° 70° 90°
48°
High: 57°
Avg: 48°
Low: 38°
Jan
51°
High: 62°
Avg: 51°
Low: 40°
Feb
54°
High: 65°
Avg: 54°
Low: 42°
Mar
57°
High: 69°
Avg: 57°
Low: 44°
Apr
62°
High: 75°
Avg: 62°
Low: 48°
May
67°
High: 83°
Avg: 67°
Low: 51°
Jun
70°
High: 86°
Avg: 70°
Low: 54°
Jul
70°
High: 86°
Avg: 70°
Low: 53°
Aug
68°
High: 85°
Avg: 68°
Low: 51°
Sep
63°
High: 78°
Avg: 63°
Low: 47°
Oct
54°
High: 65°
Avg: 54°
Low: 42°
Nov
48°
High: 57°
Avg: 48°
Low: 38°
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 3" 6" 9" 9.3"
9.3"
9.27"
Jan
9.3"
9.32"
Feb
7.4"
7.38"
Mar
4.7"
4.72"
Apr
3.5"
3.54"
May
0.0"
0.00"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
3.5"
3.53"
Oct
6.7"
6.66"
Nov
8.8"
8.81"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec10h11h12h13h14h15h14h13h12h11h10h9h
Jan: 7:12 AM – 4:48 PM · 9h 37m
Feb: 6:43 AM – 5:17 PM · 10h 34m
Mar: 6:09 AM – 5:51 PM · 11h 42m
Apr: 5:30 AM – 6:30 PM · 13h 00m
May: 4:58 AM – 7:02 PM · 14h 05m
Jun: 4:40 AM – 7:20 PM · 14h 39m
Jul: 4:47 AM – 7:13 PM · 14h 25m
Aug: 5:15 AM – 6:45 PM · 13h 29m
Sep: 5:53 AM – 6:07 PM · 12h 14m
Oct: 6:31 AM – 5:29 PM · 10h 59m
Nov: 7:04 AM – 4:56 PM · 9h 53m
Dec: 7:20 AM – 4:40 PM · 9h 21m
Daylight Longest: 14h 40m · Shortest: 9h 20m

Nearby Stations

Petaluma AP, CA February 28 - November 25 Napa State Hospital, CA February 12 - December 4 Napa Co AP, CA March 5 - November 21 Saint Helena, CA February 3 - December 4 Santa Rosa, CA February 25 - December 1 Angwin Pacific Union College, CA April 7 - December 5

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