Frost Dates for Roseland, CA

Based on data from Santa Rosa 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 25
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. December 1
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 7
First Fall Frost November 21

Hard Freeze (28°F)

Last Spring Hard Freeze January 20
First Fall Hard Freeze December 16
38.42°N, -122.73°W © OpenStreetMap

Growing Season

280 Days February 25 to December 1

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

Avg. annual minimum: 25 to 30°F (−4 to −1°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°
49°
High: 60°F
Avg: 49°F
Low: 38°F
Jan
52°
High: 64°F
Avg: 52°F
Low: 40°F
Feb
54°
High: 67°F
Avg: 54°F
Low: 42°F
Mar
57°
High: 71°F
Avg: 57°F
Low: 44°F
Apr
61°
High: 75°F
Avg: 61°F
Low: 48°F
May
66°
High: 80°F
Avg: 66°F
Low: 51°F
Jun
67°
High: 82°F
Avg: 67°F
Low: 52°F
Jul
68°
High: 83°F
Avg: 68°F
Low: 53°F
Aug
67°
High: 84°F
Avg: 67°F
Low: 51°F
Sep
63°
High: 79°F
Avg: 63°F
Low: 48°F
Oct
55°
High: 67°F
Avg: 55°F
Low: 42°F
Nov
49°
High: 59°F
Avg: 49°F
Low: 38°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 7.5"
7.0"
7.01"
Jan
7.5"
7.47"
Feb
7.1"
7.06"
Mar
4.4"
4.41"
Apr
4.3"
4.30"
May
0.3"
0.26"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
3.2"
3.16"
Oct
5.1"
5.14"
Nov
7.1"
7.11"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
Jan: 7:12 AM – 4:48 PM · 9h 36m
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 01m
May: 4:57 AM – 7:03 PM · 14h 05m
Jun: 4:40 AM – 7:20 PM · 14h 40m
Jul: 4:47 AM – 7:13 PM · 14h 26m
Aug: 5:15 AM – 6:45 PM · 13h 30m
Sep: 5:53 AM – 6:07 PM · 12h 14m
Oct: 6:31 AM – 5:29 PM · 10h 58m
Nov: 7:04 AM – 4:56 PM · 9h 52m
Dec: 7:20 AM – 4:40 PM · 9h 20m
Daylight Longest: 14h 41m · Shortest: 9h 19m

Nearby Stations

Santa Rosa Sonoma Co AP, CA March 2 - November 20 Graton, CAMarch 20 - November 13 Calistoga, CA March 2 - November 23 Saint Helena, CA February 3 - December 4 Occidental, CA January 29 - December 30 Healdsburg, CA February 15 - December 2

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