Frost Dates for Keokuk Lock Dam 19, 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 10
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 27
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 17
First Fall Frost October 21

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 2
First Fall Hard Freeze November 5
40.40°N, -91.38°W © OpenStreetMap

Growing Season

200 Days April 10 to October 27

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: 33°
Avg: 25°
Low: 17°
Jan
29°
High: 38°
Avg: 29°
Low: 20°
Feb
40°
High: 50°
Avg: 40°
Low: 31°
Mar
52°
High: 62°
Avg: 52°
Low: 41°
Apr
63°
High: 73°
Avg: 63°
Low: 53°
May
72°
High: 82°
Avg: 72°
Low: 63°
Jun
76°
High: 86°
Avg: 76°
Low: 67°
Jul
74°
High: 84°
Avg: 74°
Low: 65°
Aug
67°
High: 77°
Avg: 67°
Low: 56°
Sep
55°
High: 65°
Avg: 55°
Low: 44°
Oct
42°
High: 51°
Avg: 42°
Low: 33°
Nov
30°
High: 38°
Avg: 30°
Low: 23°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 6" 7.1"
2.9"
2.94"
Jan
2.9"
2.87"
Feb
4.4"
4.44"
Mar
6.0"
6.03"
Apr
6.6"
6.56"
May
6.8"
6.82"
Jun
6.6"
6.59"
Jul
6.7"
6.68"
Aug
7.1"
7.06"
Sep
5.3"
5.35"
Oct
4.4"
4.40"
Nov
3.6"
3.63"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h14h15h15h14h12h11h10h9h
Jan: 7:17 AM – 4:43 PM · 9h 25m
Feb: 6:46 AM – 5:14 PM · 10h 27m
Mar: 6:10 AM – 5:50 PM · 11h 41m
Apr: 5:28 AM – 6:32 PM · 13h 05m
May: 4:53 AM – 7:07 PM · 14h 15m
Jun: 4:34 AM – 7:26 PM · 14h 52m
Jul: 4:42 AM – 7:18 PM · 14h 37m
Aug: 5:12 AM – 6:48 PM · 13h 36m
Sep: 5:52 AM – 6:08 PM · 12h 15m
Oct: 6:33 AM – 5:27 PM · 10h 54m
Nov: 7:09 AM – 4:51 PM · 9h 43m
Dec: 7:26 AM – 4:34 PM · 9h 08m
Daylight Longest: 14h 53m · Shortest: 9h 07m

Nearby Stations

Bentley, ILApril 13 - October 22 Ft Madison, IA April 12 - October 25 Canton L&D 20, MO April 11 - October 23 Donnellson, IA April 17 - October 22 La Harpe, ILApril 21 - October 19 Golden, ILApril 18 - October 21

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