Frost Dates for Los Osos, CA

Based on data from Morro Bay Fire Dept weather station, 4 miles away

Elevation: 131 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. January 19
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. January 14

This location has a nearly year-round growing season with a brief frost risk period in winter.

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 January 31
First Fall Frost January 2
35.31°N, 120.83°W © OpenStreetMap

Growing Season

361 Days January 19 to January 14

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 10a

Avg. annual minimum: 30 to 35°F

Learn more

Köppen Climate

The 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

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January65°56°46°
February65°57°48°
March66°57°49°
April67°58°49°
May67°59°52°
June66°60°54°
July67°62°57°
August70°63°57°
September72°64°56°
October73°63°54°
November69°60°50°
December65°55°46°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January8.8
February7.5
March7.4
April3.9
May0.0
June0.0
July0.0
August0.0
September0.0
October0.8
November5.4
December7.3

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 23m · Shortest: 9h 37m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:17 AM5:09 PM9h 52m
February6:57 AM5:39 PM10h 43m
March7:21 AM7:05 PM11h 44m
April6:37 AM7:31 PM12h 54m
May6:04 AM7:56 PM13h 52m
June5:52 AM8:15 PM14h 22m
July6:04 AM8:14 PM14h 10m
August6:27 AM7:48 PM13h 20m
September6:52 AM7:04 PM12h 13m
October7:16 AM6:21 PM11h 05m
November6:46 AM4:51 PM10h 06m
December7:11 AM4:48 PM9h 37m

Nearby Stations

San Luis Obispo Poly, CA January 16 - December 25 San Luis Obispo AP, CA January 31 - December 11 Pismo Beach, CA February 1 - January 4 Paso Robles, CA March 15 - November 10 Paso Robles Muni AP, CA April 4 - November 5 Hearst Castle, CA February 13 - February 1

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