Frost Dates for Alamosa East, CO

Based on data from Alamosa 1e weather station, 1 miles away

Elevation: 7539 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. May 30
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 17

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 June 4
First Fall Frost September 12

Hard Freeze (28°F)

Last Spring Hard Freeze May 16
First Fall Hard Freeze September 27
37.48°N, 105.84°W © OpenStreetMap

Growing Season

110 Days May 30 to September 17

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 4b

Avg. annual minimum: −25 to −20°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
January35°17°0°
February43°25°7°
March53°35°17°
April59°42°26°
May69°52°34°
June79°61°42°
July83°65°48°
August80°63°45°
September75°56°37°
October64°45°25°
November51°32°13°
December37°19°2°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.6
February1.4
March1.8
April2.5
May2.0
June1.2
July1.7
August1.7
September1.9
October2.1
November1.3
December1.3

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 35m · Shortest: 9h 25m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:22 AM5:03 PM9h 41m
February6:60 AM5:36 PM10h 37m
March7:22 AM7:04 PM11h 43m
April6:34 AM7:33 PM12h 58m
May5:59 AM8:00 PM14h 01m
June5:46 AM8:21 PM14h 34m
July5:59 AM8:19 PM14h 21m
August6:24 AM7:51 PM13h 27m
September6:51 AM7:05 PM12h 14m
October7:18 AM6:19 PM11h 00m
November6:50 AM4:47 PM9h 57m
December7:16 AM4:42 PM9h 26m

Nearby Stations

Alamosa San Luis AP, CO June 7 - September 15 Waverly 1w, CO June 6 - September 15 Blanca 4 Nw, CO May 25 - September 22 Monte Vista 2w, CO June 11 - September 13 Manassa, COMay 28 - September 21 Center 4 Ssw, CO May 24 - September 24

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview