Frost Dates for Petaluma, CA

Based on data from Petaluma AP weather station, 2 miles away

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. February 28
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 25
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)

Last Spring Hard Freeze January 17
First Fall Hard Freeze December 9
38.23°N, -122.64°W © OpenStreetMap

Growing Season

271 Days February 28 to November 25

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 9a

Avg. annual minimum: 20 to 25°F (−7 to −4°C)

Learn more

Köppen Climate iThe 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

30° 50° 70° 90°
48°
High: 58°F
Avg: 48°F
Low: 39°F
Jan
51°
High: 61°F
Avg: 51°F
Low: 40°F
Feb
53°
High: 65°F
Avg: 53°F
Low: 42°F
Mar
56°
High: 68°F
Avg: 56°F
Low: 44°F
Apr
60°
High: 72°F
Avg: 60°F
Low: 47°F
May
64°
High: 78°F
Avg: 64°F
Low: 50°F
Jun
67°
High: 81°F
Avg: 67°F
Low: 52°F
Jul
67°
High: 81°F
Avg: 67°F
Low: 53°F
Aug
67°
High: 82°F
Avg: 67°F
Low: 51°F
Sep
62°
High: 76°F
Avg: 62°F
Low: 48°F
Oct
54°
High: 66°F
Avg: 54°F
Low: 42°F
Nov
48°
High: 58°F
Avg: 48°F
Low: 38°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 3" 6" 8.1"
7.3"
7.27"
Jan
8.1"
8.05"
Feb
7.8"
7.82"
Mar
4.8"
4.84"
Apr
4.3"
4.33"
May
0.0"
0.00"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
2.6"
2.64"
Oct
5.6"
5.60"
Nov
7.1"
7.07"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
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: 4:41 AM – 7:19 PM · 14h 39m
Jul: 4:48 AM – 7:12 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

Sonoma, CAMarch 2 - November 27 Santa Rosa, CA February 25 - December 1 Napa Co AP, CA March 5 - November 21 San Rafael Civic Ctr, CA January 11 - December 21 Graton, CAMarch 20 - November 13 Napa State Hospital, CA February 12 - December 4

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