Frost Dates for Aristocrat Ranchettes, CO

Based on data from Brighton 3 Se weather station, 12 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. May 3
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. October 7
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 May 8
First Fall Frost October 2

Hard Freeze (28°F)

Last Spring Hard Freeze April 23
First Fall Hard Freeze October 16
40.11°N, -104.76°W © OpenStreetMap

Growing Season

157 Days May 3 to October 7

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.

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

10° 30° 50° 70° 90°
30°
High: 44°F
Avg: 30°F
Low: 16°F
Jan
32°
High: 46°F
Avg: 32°F
Low: 19°F
Feb
41°
High: 56°F
Avg: 41°F
Low: 27°F
Mar
48°
High: 63°F
Avg: 48°F
Low: 34°F
Apr
58°
High: 72°F
Avg: 58°F
Low: 43°F
May
68°
High: 84°F
Avg: 68°F
Low: 52°F
Jun
74°
High: 90°F
Avg: 74°F
Low: 58°F
Jul
72°
High: 88°F
Avg: 72°F
Low: 56°F
Aug
64°
High: 80°F
Avg: 64°F
Low: 47°F
Sep
50°
High: 66°F
Avg: 50°F
Low: 35°F
Oct
39°
High: 53°F
Avg: 39°F
Low: 25°F
Nov
30°
High: 44°F
Avg: 30°F
Low: 16°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 4.3"
2.1"
2.14"
Jan
1.9"
1.85"
Feb
2.8"
2.78"
Mar
3.6"
3.59"
Apr
4.3"
4.29"
May
3.3"
3.27"
Jun
3.0"
3.03"
Jul
3.3"
3.28"
Aug
2.7"
2.72"
Sep
3.1"
3.06"
Oct
2.5"
2.46"
Nov
1.8"
1.84"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h15h14.5h13.5h12h11h9.5h9h
Jan: 7:16 AM – 4:44 PM · 9h 28m
Feb: 6:46 AM – 5:14 PM · 10h 29m
Mar: 6:09 AM – 5:51 PM · 11h 41m
Apr: 5:28 AM – 6:32 PM · 13h 04m
May: 4:54 AM – 7:06 PM · 14h 12m
Jun: 4:35 AM – 7:25 PM · 14h 49m
Jul: 4:43 AM – 7:17 PM · 14h 34m
Aug: 5:13 AM – 6:47 PM · 13h 35m
Sep: 5:53 AM – 6:07 PM · 12h 15m
Oct: 6:33 AM – 5:27 PM · 10h 55m
Nov: 7:08 AM – 4:52 PM · 9h 45m
Dec: 7:25 AM – 4:35 PM · 9h 11m
Daylight Longest: 14h 50m · Shortest: 9h 10m

Nearby Stations

Northglenn, COMay 2 - October 11 Denver Intl AP, CO May 5 - October 9 Denver-Stapleton, CO May 4 - October 8 Denver Water Dept, CO April 30 - October 12 Wheat Ridge 2, CO May 5 - October 5 Longmont 2 Ese, CO May 7 - October 5

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview