Frost Dates for Idaho Springs, CO

Based on data from Georgetown weather station, 10 miles away

Elevation: 7526 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 19

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 5
First Fall Frost September 14

Hard Freeze (28°F)

Last Spring Hard Freeze May 15
First Fall Hard Freeze September 30
39.74°N, 105.51°W © OpenStreetMap

Growing Season

112 Days May 30 to September 19

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 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

The 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

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
January36°26°16°
February38°27°15°
March45°33°21°
April50°38°26°
May60°47°35°
June72°57°42°
July77°63°49°
August75°61°47°
September68°54°39°
October57°44°30°
November44°33°22°
December36°26°15°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.7
February1.9
March2.8
April3.2
May3.5
June2.5
July3.0
August3.1
September2.6
October2.9
November2.2
December1.7

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 49m · Shortest: 9h 11m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:28 AM4:57 PM9h 29m
February7:03 AM5:32 PM10h 30m
March7:22 AM7:03 PM11h 41m
April6:31 AM7:35 PM13h 03m
May5:53 AM8:05 PM14h 11m
June5:39 AM8:27 PM14h 48m
July5:52 AM8:25 PM14h 33m
August6:20 AM7:54 PM13h 34m
September6:50 AM7:05 PM12h 15m
October7:20 AM6:16 PM10h 55m
November6:55 AM4:41 PM9h 46m
December7:23 AM4:35 PM9h 12m

Nearby Stations

Cabin Creek, CO June 6 - September 19 Grant, COJune 15 - September 9 Fraser, CO Dillon 1 E, CO Evergreen, CO May 23 - September 22 Coal Creek Canyon, CO June 5 - September 16

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