Frost Dates for Aspen, CO

Based on data from Aspen 1sw weather station, 1 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. June 2
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. September 23
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 8
First Fall Frost September 19

Hard Freeze (28°F)

Last Spring Hard Freeze May 18
First Fall Hard Freeze October 1
39.19°N, -106.82°W © OpenStreetMap

Growing Season

113 Days June 2 to September 23

USDA Hardiness Zone iHardiness 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 5b

Avg. annual minimum: −15 to −10°F (−26 to −23°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Dfc Subarctic

Short, cool summers and long, very cold winters. Growing seasons of 3–4 months require fast-maturing varieties. Root vegetables, potatoes, and cold-hardy greens are the most reliable.

Köppen climate map

Temperature

0° 20° 40° 60° 80°
21°
High: 32°F
Avg: 21°F
Low: 10°F
Jan
24°
High: 35°F
Avg: 24°F
Low: 13°F
Feb
31°
High: 43°F
Avg: 31°F
Low: 20°F
Mar
38°
High: 50°F
Avg: 38°F
Low: 27°F
Apr
48°
High: 60°F
Avg: 48°F
Low: 35°F
May
56°
High: 71°F
Avg: 56°F
Low: 42°F
Jun
62°
High: 76°F
Avg: 62°F
Low: 48°F
Jul
60°
High: 73°F
Avg: 60°F
Low: 47°F
Aug
53°
High: 67°F
Avg: 53°F
Low: 40°F
Sep
43°
High: 55°F
Avg: 43°F
Low: 30°F
Oct
31°
High: 42°F
Avg: 31°F
Low: 19°F
Nov
21°
High: 32°F
Avg: 21°F
Low: 10°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 4.4"
3.1"
3.10"
Jan
3.1"
3.14"
Feb
4.3"
4.31"
Mar
4.1"
4.06"
Apr
3.8"
3.81"
May
3.0"
3.00"
Jun
3.1"
3.10"
Jul
3.1"
3.10"
Aug
3.4"
3.38"
Sep
4.4"
4.44"
Oct
4.2"
4.22"
Nov
3.2"
3.18"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
Jan: 7:14 AM – 4:46 PM · 9h 32m
Feb: 6:44 AM – 5:16 PM · 10h 31m
Mar: 6:09 AM – 5:51 PM · 11h 42m
Apr: 5:29 AM – 6:31 PM · 13h 02m
May: 4:56 AM – 7:04 PM · 14h 09m
Jun: 4:38 AM – 7:22 PM · 14h 45m
Jul: 4:45 AM – 7:15 PM · 14h 30m
Aug: 5:14 AM – 6:46 PM · 13h 32m
Sep: 5:53 AM – 6:07 PM · 12h 14m
Oct: 6:32 AM – 5:28 PM · 10h 57m
Nov: 7:06 AM – 4:54 PM · 9h 48m
Dec: 7:22 AM – 4:38 PM · 9h 15m
Daylight Longest: 14h 46m · Shortest: 9h 14m

Nearby Stations

Aspen Pitkin Co AP, CO May 31 - September 23 Meredith, CO Crested Butte, CO Sugarloaf Rsvr, CO Twin Lakes Rsvr, CO June 16 - September 10 Leadville Lake Co AP, CO

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