Frost Dates for Flagler 1s, CO
Elevation: 1500 m
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 5
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 10
First Fall Frost
October 3
Hard Freeze (28°F)
Last Spring Hard Freeze
April 26
First Fall Hard Freeze
October 16
Growing Season
156 Days
May 5 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 5b
Avg. annual minimum: −15 to −10°F
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.
Temperature
10°
30°
50°
70°
90°
Avg High
Avg Temp
Avg Low
Light Frost (32°F)
Hard Frost (28°F)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 45° | 31° | 17° |
| February | 47° | 33° | 19° |
| March | 57° | 42° | 27° |
| April | 64° | 49° | 35° |
| May | 73° | 59° | 44° |
| June | 85° | 69° | 54° |
| July | 89° | 74° | 60° |
| August | 87° | 72° | 58° |
| September | 79° | 64° | 49° |
| October | 66° | 51° | 36° |
| November | 54° | 40° | 26° |
| December | 44° | 30° | 17° |
Precipitation
0"
3"
6"
9"
10.6"
Precipitation table
| Month | Precipitation |
|---|---|
| January | 0.0 |
| February | 0.0 |
| March | 4.0 |
| April | 7.4 |
| May | 9.5 |
| June | 9.2 |
| July | 9.0 |
| August | 10.6 |
| September | 3.0 |
| October | 0.0 |
| November | 0.0 |
| December | 0.0 |
Sunrise / Sunset
Daylight
Longest: 14h 46m · Shortest: 9h 14m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:14 AM | 4:46 PM | 9h 31m |
| February | 6:45 AM | 5:15 PM | 10h 31m |
| March | 6:09 AM | 5:51 PM | 11h 42m |
| April | 5:29 AM | 6:31 PM | 13h 02m |
| May | 4:55 AM | 7:05 PM | 14h 09m |
| June | 4:37 AM | 7:23 PM | 14h 45m |
| July | 4:45 AM | 7:15 PM | 14h 31m |
| August | 5:14 AM | 6:46 PM | 13h 33m |
| September | 5:53 AM | 6:07 PM | 12h 15m |
| October | 6:32 AM | 5:28 PM | 10h 56m |
| November | 7:06 AM | 4:54 PM | 9h 48m |
| December | 7:23 AM | 4:37 PM | 9h 15m |
Nearby Stations
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