Frost Dates for Des Moines Wsfo-Johnston, IA

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. April 19
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 18
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 April 25
First Fall Frost October 12

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 9
First Fall Hard Freeze October 27
41.74°N, -93.72°W © OpenStreetMap

Growing Season

182 Days April 19 to October 18

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

Learn more

Temperature

10° 30° 50° 70° 90°
22°
High: 30°
Avg: 22°
Low: 13°
Jan
26°
High: 35°
Avg: 26°
Low: 17°
Feb
39°
High: 49°
Avg: 39°
Low: 29°
Mar
51°
High: 62°
Avg: 51°
Low: 40°
Apr
62°
High: 72°
Avg: 62°
Low: 52°
May
72°
High: 81°
Avg: 72°
Low: 62°
Jun
75°
High: 85°
Avg: 75°
Low: 66°
Jul
73°
High: 83°
Avg: 73°
Low: 64°
Aug
66°
High: 76°
Avg: 66°
Low: 55°
Sep
53°
High: 63°
Avg: 53°
Low: 43°
Oct
39°
High: 48°
Avg: 39°
Low: 30°
Nov
27°
High: 35°
Avg: 27°
Low: 19°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 6" 6.8"
2.1"
2.15"
Jan
2.6"
2.61"
Feb
3.5"
3.55"
Mar
4.6"
4.62"
Apr
6.1"
6.09"
May
6.8"
6.81"
Jun
6.1"
6.08"
Jul
5.5"
5.52"
Aug
6.0"
6.01"
Sep
4.3"
4.27"
Oct
3.0"
3.00"
Nov
2.5"
2.55"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h14h15h15h14h12h11h10h9h
Jan: 7:21 AM – 4:39 PM · 9h 17m
Feb: 6:49 AM – 5:11 PM · 10h 23m
Mar: 6:10 AM – 5:50 PM · 11h 40m
Apr: 5:26 AM – 6:34 PM · 13h 08m
May: 4:49 AM – 7:11 PM · 14h 21m
Jun: 4:30 AM – 7:30 PM · 15h 01m
Jul: 4:38 AM – 7:22 PM · 14h 45m
Aug: 5:09 AM – 6:51 PM · 13h 41m
Sep: 5:52 AM – 6:08 PM · 12h 16m
Oct: 6:35 AM – 5:25 PM · 10h 51m
Nov: 7:12 AM – 4:48 PM · 9h 36m
Dec: 7:31 AM – 4:29 PM · 8h 59m
Daylight Longest: 15h 02m · Shortest: 8h 58m

Nearby Stations

Ankeny, IAApril 23 - October 15 Des Moines Intl AP, IA April 18 - October 20 Ames 5 Se, IA April 26 - October 12 Ames Muni AP, IA April 26 - October 8 Ames 8 Wsw, IA April 23 - October 14 Perry, IAApril 25 - October 10

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