Frost Dates for Hennepin, IL

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 18
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 22
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 23
First Fall Frost October 17

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 6
First Fall Hard Freeze November 1
41.25°N, -89.34°W © OpenStreetMap

Growing Season

187 Days April 18 to October 22

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

10° 30° 50° 70° 90°
25°
High: 32°
Avg: 25°
Low: 17°
Jan
29°
High: 37°
Avg: 29°
Low: 20°
Feb
40°
High: 50°
Avg: 40°
Low: 30°
Mar
52°
High: 64°
Avg: 52°
Low: 41°
Apr
63°
High: 74°
Avg: 63°
Low: 51°
May
72°
High: 82°
Avg: 72°
Low: 61°
Jun
75°
High: 85°
Avg: 75°
Low: 65°
Jul
73°
High: 83°
Avg: 73°
Low: 62°
Aug
66°
High: 77°
Avg: 66°
Low: 55°
Sep
54°
High: 65°
Avg: 54°
Low: 43°
Oct
41°
High: 50°
Avg: 41°
Low: 32°
Nov
29°
High: 37°
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" 3" 6" 9" 9.0"
4.2"
4.22"
Jan
3.8"
3.77"
Feb
5.4"
5.43"
Mar
6.3"
6.32"
Apr
7.9"
7.90"
May
7.8"
7.80"
Jun
8.3"
8.33"
Jul
9.0"
9.01"
Aug
7.7"
7.68"
Sep
6.2"
6.20"
Oct
5.4"
5.41"
Nov
4.9"
4.94"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h14h15h15h14h12h11h10h9h
Jan: 7:20 AM – 4:40 PM · 9h 20m
Feb: 6:48 AM – 5:12 PM · 10h 24m
Mar: 6:10 AM – 5:50 PM · 11h 40m
Apr: 5:27 AM – 6:33 PM · 13h 07m
May: 4:51 AM – 7:09 PM · 14h 19m
Jun: 4:31 AM – 7:29 PM · 14h 58m
Jul: 4:39 AM – 7:21 PM · 14h 42m
Aug: 5:10 AM – 6:50 PM · 13h 39m
Sep: 5:52 AM – 6:08 PM · 12h 16m
Oct: 6:34 AM – 5:26 PM · 10h 52m
Nov: 7:11 AM – 4:49 PM · 9h 38m
Dec: 7:29 AM – 4:31 PM · 9h 02m
Daylight Longest: 14h 59m · Shortest: 9h 01m

Nearby Stations

Hennepin Wtr Trmt Plt, IL April 24 - October 17 Princeton, IL April 22 - October 17 Peru, ILApril 24 - October 18 Lacon, ILApril 20 - October 17 Ottawa 5sw, IL April 20 - October 22 Walnut, ILApril 24 - October 14

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