Frost Dates for Winchester, ID

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 23
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. September 25
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 June 1
First Fall Frost September 17

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze May 2
First Fall Hard Freeze October 9
46.24°N, -116.62°W © OpenStreetMap

Growing Season

125 Days May 23 to September 25

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 6a

Learn more

Temperature

20° 40° 60° 80°
30°
High: 37°
Avg: 30°
Low: 23°
Jan
31°
High: 39°
Avg: 31°
Low: 23°
Feb
36°
High: 45°
Avg: 36°
Low: 27°
Mar
42°
High: 52°
Avg: 42°
Low: 32°
Apr
49°
High: 60°
Avg: 49°
Low: 39°
May
55°
High: 67°
Avg: 55°
Low: 43°
Jun
64°
High: 78°
Avg: 64°
Low: 49°
Jul
64°
High: 79°
Avg: 64°
Low: 49°
Aug
56°
High: 70°
Avg: 56°
Low: 42°
Sep
45°
High: 56°
Avg: 45°
Low: 35°
Oct
35°
High: 43°
Avg: 35°
Low: 28°
Nov
29°
High: 35°
Avg: 29°
Low: 22°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.6"
2.0"
2.03"
Jan
1.9"
1.85"
Feb
2.7"
2.71"
Mar
2.8"
2.79"
Apr
3.6"
3.57"
May
3.6"
3.60"
Jun
2.1"
2.14"
Jul
2.3"
2.32"
Aug
2.6"
2.65"
Sep
2.8"
2.79"
Oct
2.4"
2.44"
Nov
2.2"
2.17"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:36 AM – 4:24 PM · 8h 48m
Feb: 6:57 AM – 5:03 PM · 10h 06m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 20m
May: 4:37 AM – 7:23 PM · 14h 46m
Jun: 4:13 AM – 7:47 PM · 15h 34m
Jul: 4:23 AM – 7:37 PM · 15h 14m
Aug: 5:01 AM – 6:59 PM · 13h 59m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 39m
Nov: 7:25 AM – 4:35 PM · 9h 10m
Dec: 7:47 AM – 4:13 PM · 8h 26m
Daylight Longest: 15h 35m · Shortest: 8h 25m

Nearby Stations

Cottonwood 2 Wsw, ID May 6 - October 13 Nezperce, IDMay 24 - September 20 Lewiston Nez Perce Co AP, ID April 6 - October 26 Dworshak Fish Hatchery, ID April 20 - October 20 Kamiah, IDApril 29 - October 5 Grangeville, IDMay 9 - October 3

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