Frost Dates for Riverside, CA

Based on data from Riverside Fire Stn 3 weather station, 0 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. January 9
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 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 January 25
First Fall Frost December 15

Hard Freeze (28°F)

Last Spring Hard Freeze December 31
First Fall Hard Freeze December 29
33.95°N, -117.40°W © OpenStreetMap

Growing Season

351 Days January 9 to December 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 10a

Avg. annual minimum: 30 to 35°F (−1 to 2°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

BSh Hot Semi-Arid (Steppe)

Hot with low but not negligible rainfall. Less extreme than true desert. Dryland farming techniques and drought-tolerant varieties work well. Mulching and water conservation are key.

Köppen climate map

Temperature

40° 60° 80° 100°
56°
High: 70°F
Avg: 56°F
Low: 43°F
Jan
57°
High: 70°F
Avg: 57°F
Low: 44°F
Feb
60°
High: 73°F
Avg: 60°F
Low: 46°F
Mar
64°
High: 78°F
Avg: 64°F
Low: 50°F
Apr
68°
High: 81°F
Avg: 68°F
Low: 55°F
May
74°
High: 89°F
Avg: 74°F
Low: 59°F
Jun
80°
High: 95°F
Avg: 80°F
Low: 64°F
Jul
81°
High: 97°F
Avg: 81°F
Low: 65°F
Aug
77°
High: 93°F
Avg: 77°F
Low: 62°F
Sep
69°
High: 84°F
Avg: 69°F
Low: 55°F
Oct
61°
High: 76°F
Avg: 61°F
Low: 47°F
Nov
56°
High: 69°F
Avg: 56°F
Low: 42°F
Dec
Avg High Avg Temp Avg Low

Precipitation

0" 2" 4" 6" 6.3"
6.2"
6.23"
Jan
6.3"
6.25"
Feb
6.2"
6.21"
Mar
0.7"
0.71"
Apr
0.0"
0.00"
May
0.0"
0.00"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
0.0"
0.00"
Oct
0.1"
0.15"
Nov
5.0"
5.05"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec10h11h11.5h13h14h14h14h13.5h12h11h10h9.5h
Jan: 7:01 AM – 4:59 PM · 9h 58m
Feb: 6:37 AM – 5:23 PM · 10h 47m
Mar: 6:08 AM – 5:52 PM · 11h 45m
Apr: 5:34 AM – 6:26 PM · 12h 51m
May: 5:07 AM – 6:53 PM · 13h 46m
Jun: 4:53 AM – 7:07 PM · 14h 15m
Jul: 4:58 AM – 7:02 PM · 14h 03m
Aug: 5:22 AM – 6:38 PM · 13h 16m
Sep: 5:54 AM – 6:06 PM · 12h 12m
Oct: 6:26 AM – 5:34 PM · 11h 08m
Nov: 6:54 AM – 5:06 PM · 10h 12m
Dec: 7:08 AM – 4:52 PM · 9h 45m
Daylight Longest: 14h 16m · Shortest: 9h 44m

Nearby Stations

Riverside Citrus Exp, CA January 10 - January 2 Riverside Muni AP, CA January 9 - December 30 Redlands, CA January 27 - December 19 Ontario Intl AP, CA January 4 - December 30 Chino AP, CA January 17 - December 19 Elsinore, CA January 28 - December 18

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