Frost Dates for Washington, UT

Based on data from St George weather station, 5 miles away

Elevation: 2792 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. March 14
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. November 10

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 March 25
First Fall Frost November 5

Hard Freeze (28°F)

Last Spring Hard Freeze February 27
First Fall Hard Freeze November 20
37.13°N, 113.51°W © OpenStreetMap

Growing Season

241 Days March 14 to November 10

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.
BWk Cold Desert

Dry with hot summers and cold winters. Rainfall is minimal year-round. Short growing seasons and large temperature swings require careful timing. Cold-hardy, drought-tolerant plants are best suited.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January54°41°28°
February59°46°32°
March68°53°39°
April75°60°46°
May85°70°56°
June96°81°65°
July102°87°72°
August100°85°70°
September92°77°61°
October79°63°47°
November64°49°35°
December53°40°28°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January3.1
February3.5
March3.3
April2.9
May0.1
June0.0
July0.8
August0.7
September0.0
October1.3
November3.0
December3.1

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 33m · Shortest: 9h 27m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:52 AM5:35 PM9h 43m
February7:30 AM6:08 PM10h 38m
March7:53 AM7:36 PM11h 43m
April7:06 AM8:04 PM12h 58m
May6:31 AM8:30 PM13h 59m
June6:18 AM8:51 PM14h 32m
July6:31 AM8:49 PM14h 19m
August6:56 AM8:21 PM13h 26m
September7:22 AM7:36 PM12h 13m
October7:49 AM6:50 PM11h 01m
November7:20 AM5:19 PM9h 58m
December7:46 AM5:14 PM9h 28m

Nearby Stations

Veyo Powerhouse, UT April 9 - November 5 La Verkin, UTApril 1 - November 5 Lytle Rch, UT March 18 - November 9 Beaver Dam, AZ March 7 - November 19 New Harmony, UTMay 9 - October 11 Enterprise, UTMay 21 - October 2

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