Frost Dates for Rancho Cucamonga, CA

Based on data from Ontario Intl AP weather station, 3 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 4
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 30
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 13
First Fall Frost December 22
34.11°N, -117.59°W © OpenStreetMap

Growing Season

361 Days January 4 to December 30

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.

Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

40° 60° 80° 100°
56°
High: 68°F
Avg: 56°F
Low: 45°F
Jan
57°
High: 68°F
Avg: 57°F
Low: 46°F
Feb
60°
High: 72°F
Avg: 60°F
Low: 49°F
Mar
63°
High: 76°F
Avg: 63°F
Low: 51°F
Apr
68°
High: 80°F
Avg: 68°F
Low: 56°F
May
73°
High: 86°F
Avg: 73°F
Low: 60°F
Jun
79°
High: 94°F
Avg: 79°F
Low: 65°F
Jul
80°
High: 95°F
Avg: 80°F
Low: 65°F
Aug
78°
High: 91°F
Avg: 78°F
Low: 64°F
Sep
70°
High: 83°F
Avg: 70°F
Low: 57°F
Oct
62°
High: 75°F
Avg: 62°F
Low: 49°F
Nov
55°
High: 67°F
Avg: 55°F
Low: 44°F
Dec
Avg High Avg Temp Avg Low

Precipitation

0" 2" 4" 6" 7"
7.0"
7.00"
Jan
6.1"
6.13"
Feb
4.4"
4.39"
Mar
2.1"
2.14"
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
2.4"
2.38"
Nov
4.9"
4.88"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec10h11h11.5h13h14h14.5h14h13.5h12h11h10h9.5h
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: 4:52 AM – 7:08 PM · 14h 15m
Jul: 4:58 AM – 7:02 PM · 14h 04m
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 07m
Nov: 6:54 AM – 5:06 PM · 10h 11m
Dec: 7:08 AM – 4:52 PM · 9h 44m
Daylight Longest: 14h 16m · Shortest: 9h 44m

Nearby Stations

Chino AP, CA January 17 - December 19 Pomona/Fairplex, CA January 8 - December 28 Riverside Muni AP, CA January 9 - December 30 Riverside Fire Stn 3, CA January 9 - December 25 Riverside Citrus Exp, CA January 10 - January 2 Anaheim, CA

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