Galena, IL frost dates
Last spring frostApr 26median date
First fall frostOct 15median date
Growing season172 daysfrost-free
Hardiness zone5aZone 5a
How Galena compares
- In 8 years out of 10, the last spring frost in Galena falls between April 11 and May 11, a 30-day window. The first fall frost falls between October 1 and October 28.
- The median last frost is 9 days later than the Illinois median of Apr 17.
- Its 172-day growing season is longer than 11% of the 1,287 Illinois places with a regular frost season (state median 187 days).
- The last frost is 7 days earlier than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 150 nights a year at or below 32°F.
- Compared with Dubuque, IA, 24 km away, the last frost here is 7 days later than there and the growing season is 13 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 11 |
| 50% (median) | April 26 |
| 10% (safe for tender plants) | May 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 1 |
| 50% (median) | October 15 |
| 90% (late) | October 28 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Galena, IL
Galena, IL frost dates — last frost Apr 26, first frost Oct 15, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 1 to Feb 15Transplant outside: Mar 29 to Apr 12
Start indoors: Feb 15 to Mar 1Transplant outside: May 10 to May 24
Start indoors: Feb 15 to Mar 1Transplant outside: May 10 to May 24
Start indoors: Mar 1 to Mar 15Transplant outside: May 3 to May 17
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 5 to Apr 19Sow outdoors: Mar 29 to May 3Plant for fall: Aug 20 to Sep 17
Start indoors: Mar 1 to Mar 15Transplant outside: Mar 29 to Apr 12Sow outdoors: Mar 29 to Apr 12Plant for fall: Aug 6 to Aug 27
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 12 to Apr 26Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 5 to Apr 19Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 12 to Apr 26Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 15 to Mar 29Transplant outside: May 17 to May 31Sow outdoors: May 17 to May 31
Start indoors: Mar 15 to Mar 29Transplant outside: May 3 to May 17
Sow outdoors: Mar 15 to Apr 5Plant for fall: Jul 23 to Aug 13
Sow outdoors: Mar 15 to Apr 5Plant for fall: Aug 20 to Sep 10
Sow outdoors: Mar 22 to May 3Plant for fall: Sep 3 to Sep 24
Start indoors: Mar 29 to Apr 5Transplant outside: May 10 to May 17Sow outdoors: May 3 to May 17Plant for fall: Jul 30 to Aug 13
Start indoors: Mar 29 to Apr 5Sow outdoors: May 3 to May 17Plant for fall: Aug 6 to Aug 20
Start indoors: Mar 29 to Apr 5Sow outdoors: May 3 to May 17
Start indoors: Mar 29 to Apr 5Transplant outside: May 10 to May 24
Sow outdoors: Apr 5 to May 3Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 5 to May 3Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 5 to Apr 26
Sow outdoors: Apr 12 to May 10Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 12 to May 3Plant for fall: Aug 20 to Sep 10
Sow outdoors: May 3 to May 24Plant for fall: Jul 30 to Aug 13
Sow outdoors: May 3 to May 17
Transplant outside: May 10 to May 31
Plant for fall: Oct 1 to Nov 5
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Galena, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 1 – Feb 15 | Mar 29 – Apr 12 | — | — |
| Peppers | Feb 15 – Mar 1 | May 10 – May 24 | — | — |
| Eggplant | Feb 15 – Mar 1 | May 10 – May 24 | — | — |
| Tomatoes | Mar 1 – Mar 15 | May 3 – May 17 | — | — |
| Lettuce | Mar 1 – Mar 15 | Apr 5 – Apr 19 | Mar 29 – May 3 | Aug 20 – Sep 17 |
| Kale | Mar 1 – Mar 15 | Mar 29 – Apr 12 | Mar 29 – Apr 12 | Aug 6 – Aug 27 |
| Broccoli | Mar 1 – Mar 15 | Apr 12 – Apr 26 | — | Jul 9 – Jul 30 |
| Cabbage | Mar 1 – Mar 15 | Apr 5 – Apr 19 | — | Jul 9 – Jul 30 |
| Cauliflower | Mar 1 – Mar 15 | Apr 12 – Apr 26 | — | Jul 9 – Jul 30 |
| Okra | Mar 15 – Mar 29 | May 17 – May 31 | May 17 – May 31 | — |
| Basil | Mar 15 – Mar 29 | May 3 – May 17 | — | — |
| Peas | — | — | Mar 15 – Apr 5 | Jul 23 – Aug 13 |
| Spinach | — | — | Mar 15 – Apr 5 | Aug 20 – Sep 10 |
| Radishes | — | — | Mar 22 – May 3 | Sep 3 – Sep 24 |
| Cucumbers | Mar 29 – Apr 5 | May 10 – May 17 | May 3 – May 17 | Jul 30 – Aug 13 |
| Zucchini & Summer Squash | Mar 29 – Apr 5 | — | May 3 – May 17 | Aug 6 – Aug 20 |
| Winter Squash & Pumpkins | Mar 29 – Apr 5 | — | May 3 – May 17 | — |
| Melons & Watermelon | Mar 29 – Apr 5 | May 10 – May 24 | — | — |
| Carrots | — | — | Apr 5 – May 3 | Jul 23 – Aug 6 |
| Beets | — | — | Apr 5 – May 3 | Aug 6 – Aug 20 |
| Potatoes | — | — | Apr 5 – Apr 26 | — |
| Swiss Chard | — | — | Apr 12 – May 10 | Aug 6 – Aug 20 |
| Cilantro | — | — | Apr 12 – May 3 | Aug 20 – Sep 10 |
| Green Beans | — | — | May 3 – May 24 | Jul 30 – Aug 13 |
| Sweet Corn | — | — | May 3 – May 17 | — |
| Sweet Potatoes | — | May 10 – May 31 | — | — |
| Garlic | — | — | — | Oct 1 – Nov 5 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Galena, IL weather station, 3 km away (elevation 823 ft (251 m)).
Frost dates near Galena
- Scales Mound Apr 26 · Oct 15
- East Dubuque Apr 19 · Oct 21
- Hanover May 1 · Oct 9
- Elizabeth May 1 · Oct 9
- Apple River Apr 27 · Oct 9
- Stockton Apr 27 · Oct 9
- Warren Apr 27 · Oct 9
- Nora Apr 27 · Oct 9
- Savanna May 2 · Oct 7
- Kent Apr 27 · Oct 9
Frequently asked questions
When is the last frost in Galena, IL?
The median last spring frost in Galena, IL is April 26. There is still about a 10% chance of frost after May 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Galena, IL?
The median first fall frost is October 15, with about a 10% chance of frost before October 1.
How long is the growing season in Galena, IL?
About 172 days between the median last spring frost and first fall frost.
What planting zone is Galena, IL?
Galena, IL is in USDA hardiness zone 5a.