Frost Dates for Olathe, CO

Based on data from Montrose Rgnl AP weather station, 8 miles away

Elevation: 5358 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 2
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. October 8

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 8
First Fall Frost October 3

Hard Freeze (28°F)

Last Spring Hard Freeze April 19
First Fall Hard Freeze October 20
38.60°N, 107.98°W © OpenStreetMap

Growing Season

159 Days May 2 to October 8

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
January39°27°16°
February45°34°22°
March55°42°29°
April63°49°35°
May74°59°43°
June86°69°52°
July90°74°58°
August87°71°56°
September79°63°48°
October65°51°36°
November51°38°25°
December39°27°16°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.3
February1.2
March1.6
April1.7
May1.7
June1.6
July1.9
August2.2
September2.8
October2.6
November1.8
December1.6

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 42m · Shortest: 9h 19m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:33 AM5:09 PM9h 36m
February7:09 AM5:43 PM10h 33m
March7:30 AM7:12 PM11h 42m
April6:42 AM7:42 PM13h 01m
May6:05 AM8:11 PM14h 06m
June5:52 AM8:32 PM14h 40m
July6:04 AM8:30 PM14h 26m
August6:31 AM8:01 PM13h 30m
September6:59 AM7:13 PM12h 14m
October7:28 AM6:26 PM10h 58m
November7:01 AM4:53 PM9h 52m
December7:28 AM4:47 PM9h 19m

Nearby Stations

Montrose #2, CO April 28 - October 14 Montrose 11 Ene, CO May 20 - October 1 Black Canyon Of The Gunnison, CO May 23 - October 1 Delta 3e, COMay 1 - October 7 Cimarron, CO June 20 - September 10 Ridgway, COJune 11 - September 13

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