Frost Dates for Lewiston, CA

Based on data from Trinity Rvr Hatchery weather station, 1 miles away

Elevation: 1814 ft

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 23
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 22

30% Probability

Only 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 April 30
First Fall Frost October 14

Hard Freeze (28°F)

Last Spring Hard Freeze March 28
First Fall Hard Freeze November 6
40.71°N, 122.81°W © OpenStreetMap

Growing Season

182 Days April 23 to October 22

USDA Hardiness Zone

Hardiness 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 8b

Avg. annual minimum: 15 to 20°F

Learn more

Köppen Climate

The 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

Avg High Avg Temp Avg Low Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January50°41°33°
February56°44°33°
March62°49°35°
April68°53°38°
May77°61°44°
June87°68°49°
July96°75°54°
August94°73°52°
September89°67°46°
October76°57°39°
November58°47°36°
December48°40°32°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January7.4
February6.1
March5.6
April4.5
May3.2
June2.2
July0.0
August0.0
September0.0
October5.8
November6.3
December7.1

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 55m · Shortest: 9h 05m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:39 AM5:02 PM9h 23m
February7:13 AM5:39 PM10h 26m
March7:31 AM7:11 PM11h 41m
April6:39 AM7:44 PM13h 06m
May5:59 AM8:16 PM14h 16m
June5:44 AM8:38 PM14h 54m
July5:57 AM8:36 PM14h 39m
August6:27 AM8:04 PM13h 38m
September6:58 AM7:13 PM12h 15m
October7:30 AM6:23 PM10h 53m
November7:06 AM4:47 PM9h 41m
December7:34 AM4:40 PM9h 06m

Nearby Stations

Weaverville, CAMay 3 - October 11 Redding 12 Wnw, CA March 19 - November 22 Whiskeytown Rsvr, CA February 13 - December 13 Shasta Dam, CA February 8 - December 28 Big Bar 4 E, CA April 16 - October 31 Redding Muni AP, CA March 3 - November 21

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