Frost Dates for Iona, ID

Based on data from Idaho Falls - Kifi weather station, 4 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 9
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 1
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 17
First Fall Frost September 25

Hard Freeze (28°F)

Last Spring Hard Freeze April 28
First Fall Hard Freeze October 13
43.53°N, -111.93°W © OpenStreetMap

Growing Season

145 Days May 9 to October 1

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°
23°
High: 30°F
Avg: 23°F
Low: 16°F
Jan
28°
High: 36°F
Avg: 28°F
Low: 20°F
Feb
38°
High: 48°F
Avg: 38°F
Low: 29°F
Mar
46°
High: 58°F
Avg: 46°F
Low: 34°F
Apr
55°
High: 67°F
Avg: 55°F
Low: 42°F
May
63°
High: 77°F
Avg: 63°F
Low: 49°F
Jun
71°
High: 86°F
Avg: 71°F
Low: 55°F
Jul
70°
High: 86°F
Avg: 70°F
Low: 54°F
Aug
60°
High: 75°F
Avg: 60°F
Low: 45°F
Sep
47°
High: 59°F
Avg: 47°F
Low: 35°F
Oct
34°
High: 43°F
Avg: 34°F
Low: 25°F
Nov
24°
High: 31°F
Avg: 24°F
Low: 17°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.0"
1.8"
1.82"
Jan
1.7"
1.68"
Feb
1.9"
1.95"
Mar
2.3"
2.30"
Apr
2.9"
2.88"
May
2.3"
2.32"
Jun
2.1"
2.10"
Jul
2.6"
2.64"
Aug
3.0"
3.00"
Sep
3.0"
3.02"
Oct
2.4"
2.40"
Nov
1.9"
1.93"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10.5h11.5h13h14.5h15h15h14h12.5h11h9.5h9h
Jan: 7:27 AM – 4:33 PM · 9h 06m
Feb: 6:52 AM – 5:08 PM · 10h 16m
Mar: 6:11 AM – 5:49 PM · 11h 39m
Apr: 5:24 AM – 6:36 PM · 13h 12m
May: 4:45 AM – 7:15 PM · 14h 31m
Jun: 4:23 AM – 7:37 PM · 15h 13m
Jul: 4:32 AM – 7:28 PM · 14h 56m
Aug: 5:06 AM – 6:54 PM · 13h 48m
Sep: 5:52 AM – 6:08 PM · 12h 17m
Oct: 6:37 AM – 5:23 PM · 10h 46m
Nov: 7:17 AM – 4:43 PM · 9h 26m
Dec: 7:37 AM – 4:23 PM · 8h 47m
Daylight Longest: 15h 15m · Shortest: 8h 45m

Nearby Stations

Idaho Falls Fanning Fld, ID May 23 - September 20 Rigby, IDMay 9 - October 5 Idaho Falls 16 Se, ID June 9 - September 11 Rexburg Byu Idaho, ID May 12 - September 24 Rexburg Madison Co AP, ID May 15 - September 23 Blackfoot Fire Dept, ID May 5 - October 3

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