Frost Dates for Castle Dale, UT

Elevation: 1716 m

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. May 18
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. September 27

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 May 26
First Fall Frost September 22

Hard Freeze (28°F)

Last Spring Hard Freeze May 4
First Fall Hard Freeze October 5
39.21°N, 111.01°W © OpenStreetMap

Growing Season

132 Days May 18 to September 27

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 6a

Avg. annual minimum: −10 to −5°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

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
January40°25°10°
February47°32°16°
March58°42°25°
April66°48°31°
May75°57°40°
June85°66°47°
July91°73°54°
August89°70°52°
September81°62°43°
October68°50°32°
November53°37°20°
December41°26°11°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.5
February2.4
March2.5
April2.1
May2.3
June1.8
July1.9
August1.8
September2.9
October3.5
November2.5
December2.0

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 46m · Shortest: 9h 14m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:47 AM5:19 PM9h 32m
February7:23 AM5:54 PM10h 31m
March7:43 AM7:24 PM11h 42m
April6:53 AM7:55 PM13h 02m
May6:16 AM8:25 PM14h 09m
June6:02 AM8:47 PM14h 45m
July6:15 AM8:45 PM14h 30m
August6:42 AM8:14 PM13h 32m
September7:11 AM7:26 PM12h 14m
October7:41 AM6:37 PM10h 57m
November7:15 AM5:03 PM9h 48m
December7:42 AM4:57 PM9h 15m

Nearby Stations

Ferron, UTMay 6 - October 10 Wellington 3 E, UT May 27 - September 26 Electric Lake, UT Salina 24 E, UT May 29 - September 26 Price Carbon Co AP, UT May 3 - October 12 Ephraim, UTMay 28 - September 20

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