Frost Dates for New Castle, CO

Based on data from Rifle 3ene weather station, 10 miles away

Elevation: 5597 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 23
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 25

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 30
First Fall Frost September 20

Hard Freeze (28°F)

Last Spring Hard Freeze May 9
First Fall Hard Freeze October 4
39.57°N, 107.54°W © OpenStreetMap

Growing Season

125 Days May 23 to September 25

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 5a

Avg. annual minimum: −20 to −15°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
January37°24°10°
February42°29°15°
March55°38°22°
April62°45°28°
May72°54°37°
June83°64°45°
July88°70°52°
August85°67°49°
September79°60°41°
October64°47°30°
November50°35°20°
December37°24°11°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.9
February1.7
March1.9
April2.1
May2.3
June2.4
July2.0
August2.3
September3.1
October3.1
November2.1
December2.2

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 48m · Shortest: 9h 12m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:35 AM5:05 PM9h 30m
February7:10 AM5:40 PM10h 30m
March7:30 AM7:11 PM11h 41m
April6:40 AM7:43 PM13h 03m
May6:02 AM8:12 PM14h 11m
June5:48 AM8:35 PM14h 47m
July6:00 AM8:33 PM14h 32m
August6:28 AM8:02 PM13h 34m
September6:58 AM7:13 PM12h 15m
October7:28 AM6:24 PM10h 56m
November7:03 AM4:49 PM9h 47m
December7:30 AM4:43 PM9h 13m

Nearby Stations

Rifle Garfield Co AP, CO May 11 - October 4 Glenwood Spgs #2, CO May 13 - October 3 Collbran 1wsw, CO May 17 - September 30 Shoshone, COMay 1 - October 14 Bonham Rsvr, CO Meeker, COJune 4 - September 16

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