Frost Dates for Port Byron, IL

Based on data from Le Claire L&D 14 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. April 16
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 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 April 22
First Fall Frost October 20

Hard Freeze (28°F)

Last Spring Hard Freeze April 6
First Fall Hard Freeze November 2
41.61°N, -90.34°W © OpenStreetMap

Growing Season

192 Days April 16 to October 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 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.

Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

Köppen climate map

Temperature

10° 30° 50° 70° 90°
22°
High: 31°F
Avg: 22°F
Low: 14°F
Jan
26°
High: 35°F
Avg: 26°F
Low: 18°F
Feb
38°
High: 47°F
Avg: 38°F
Low: 28°F
Mar
50°
High: 61°F
Avg: 50°F
Low: 40°F
Apr
62°
High: 72°F
Avg: 62°F
Low: 52°F
May
72°
High: 82°F
Avg: 72°F
Low: 62°F
Jun
76°
High: 85°F
Avg: 76°F
Low: 66°F
Jul
74°
High: 83°F
Avg: 74°F
Low: 64°F
Aug
66°
High: 77°F
Avg: 66°F
Low: 56°F
Sep
54°
High: 64°F
Avg: 54°F
Low: 44°F
Oct
40°
High: 48°F
Avg: 40°F
Low: 31°F
Nov
28°
High: 36°F
Avg: 28°F
Low: 21°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 6" 7.2"
2.2"
2.16"
Jan
2.4"
2.42"
Feb
3.5"
3.48"
Mar
4.8"
4.83"
Apr
6.3"
6.30"
May
6.8"
6.85"
Jun
6.5"
6.51"
Jul
7.2"
7.19"
Aug
5.8"
5.79"
Sep
3.7"
3.70"
Oct
3.4"
3.39"
Nov
3.1"
3.08"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14.5h15h14.5h13.5h12.5h11h9.5h9h
Jan: 7:21 AM – 4:39 PM · 9h 18m
Feb: 6:48 AM – 5:12 PM · 10h 23m
Mar: 6:10 AM – 5:50 PM · 11h 40m
Apr: 5:26 AM – 6:34 PM · 13h 08m
May: 4:50 AM – 7:10 PM · 14h 21m
Jun: 4:30 AM – 7:30 PM · 14h 60m
Jul: 4:38 AM – 7:22 PM · 14h 44m
Aug: 5:10 AM – 6:50 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: 7:30 AM – 4:30 PM · 9h 00m
Daylight Longest: 15h 01m · Shortest: 8h 59m

Nearby Stations

Rock Island L&D 15, IL April 19 - October 22 Davenport Wfo, IA April 21 - October 17 Davenport, IA April 23 - October 15 Moline Quad City Intl AP, IL April 24 - October 18 Geneseo, ILApril 20 - October 20 Clinton #1, IA April 22 - October 16

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