Brookport, IL frost dates
Last spring frostApr 3median date
First fall frostOct 30median date
Growing season210 daysfrost-free
Hardiness zone7aZone 7a
How Brookport compares
- In 8 years out of 10, the last spring frost in Brookport falls between March 18 and April 21, a 34-day window. The first fall frost falls between October 17 and November 12.
- The median last frost is 14 days earlier than the Illinois median of Apr 17.
- Its 210-day growing season is longer than 97% of the 1,287 Illinois places with a regular frost season (state median 187 days).
- The last frost is 13 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 88 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 18 |
| 50% (median) | April 3 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 17 |
| 50% (median) | October 30 |
| 90% (late) | November 12 |
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 Brookport, IL
Brookport, IL frost dates — last frost Apr 3, first frost Oct 30, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 9 to Jan 23Transplant outside: Mar 6 to Mar 20
Start indoors: Jan 23 to Feb 6Transplant outside: Apr 17 to May 1
Start indoors: Jan 23 to Feb 6Transplant outside: Apr 17 to May 1
Start indoors: Feb 6 to Feb 20Transplant outside: Apr 10 to Apr 24
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 13 to Mar 27Sow outdoors: Mar 6 to Apr 10Plant for fall: Sep 4 to Oct 2
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 6 to Mar 20Sow outdoors: Mar 6 to Mar 20Plant for fall: Aug 21 to Sep 11
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 20 to Apr 3Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 13 to Mar 27Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 20 to Apr 3Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 24 to May 8Sow outdoors: Apr 24 to May 8
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 10 to Apr 24
Sow outdoors: Feb 20 to Mar 13Plant for fall: Aug 7 to Aug 28
Sow outdoors: Feb 20 to Mar 13Plant for fall: Sep 4 to Sep 25
Sow outdoors: Feb 27 to Apr 10Plant for fall: Sep 18 to Oct 9
Start indoors: Mar 6 to Mar 13Transplant outside: Apr 17 to Apr 24Sow outdoors: Apr 10 to Apr 24Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 6 to Mar 13Sow outdoors: Apr 10 to Apr 24Plant for fall: Aug 21 to Sep 4
Start indoors: Mar 6 to Mar 13Sow outdoors: Apr 10 to Apr 24
Start indoors: Mar 6 to Mar 13Transplant outside: Apr 17 to May 1
Sow outdoors: Mar 13 to Apr 10Plant for fall: Aug 7 to Aug 21
Sow outdoors: Mar 13 to Apr 10Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 13 to Apr 3
Sow outdoors: Mar 20 to Apr 17Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 20 to Apr 10Plant for fall: Sep 4 to Sep 25
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 10 to Apr 24
Transplant outside: Apr 17 to May 8
Plant for fall: Oct 16 to Nov 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Brookport, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 9 – Jan 23 | Mar 6 – Mar 20 | — | — |
| Peppers | Jan 23 – Feb 6 | Apr 17 – May 1 | — | — |
| Eggplant | Jan 23 – Feb 6 | Apr 17 – May 1 | — | — |
| Tomatoes | Feb 6 – Feb 20 | Apr 10 – Apr 24 | — | — |
| Lettuce | Feb 6 – Feb 20 | Mar 13 – Mar 27 | Mar 6 – Apr 10 | Sep 4 – Oct 2 |
| Kale | Feb 6 – Feb 20 | Mar 6 – Mar 20 | Mar 6 – Mar 20 | Aug 21 – Sep 11 |
| Broccoli | Feb 6 – Feb 20 | Mar 20 – Apr 3 | — | Jul 24 – Aug 14 |
| Cabbage | Feb 6 – Feb 20 | Mar 13 – Mar 27 | — | Jul 24 – Aug 14 |
| Cauliflower | Feb 6 – Feb 20 | Mar 20 – Apr 3 | — | Jul 24 – Aug 14 |
| Okra | Feb 20 – Mar 6 | Apr 24 – May 8 | Apr 24 – May 8 | — |
| Basil | Feb 20 – Mar 6 | Apr 10 – Apr 24 | — | — |
| Peas | — | — | Feb 20 – Mar 13 | Aug 7 – Aug 28 |
| Spinach | — | — | Feb 20 – Mar 13 | Sep 4 – Sep 25 |
| Radishes | — | — | Feb 27 – Apr 10 | Sep 18 – Oct 9 |
| Cucumbers | Mar 6 – Mar 13 | Apr 17 – Apr 24 | Apr 10 – Apr 24 | Aug 14 – Aug 28 |
| Zucchini & Summer Squash | Mar 6 – Mar 13 | — | Apr 10 – Apr 24 | Aug 21 – Sep 4 |
| Winter Squash & Pumpkins | Mar 6 – Mar 13 | — | Apr 10 – Apr 24 | — |
| Melons & Watermelon | Mar 6 – Mar 13 | Apr 17 – May 1 | — | — |
| Carrots | — | — | Mar 13 – Apr 10 | Aug 7 – Aug 21 |
| Beets | — | — | Mar 13 – Apr 10 | Aug 21 – Sep 4 |
| Potatoes | — | — | Mar 13 – Apr 3 | — |
| Swiss Chard | — | — | Mar 20 – Apr 17 | Aug 21 – Sep 4 |
| Cilantro | — | — | Mar 20 – Apr 10 | Sep 4 – Sep 25 |
| Green Beans | — | — | Apr 10 – May 1 | Aug 14 – Aug 28 |
| Sweet Corn | — | — | Apr 10 – Apr 24 | — |
| Sweet Potatoes | — | Apr 17 – May 8 | — | — |
| Garlic | — | — | — | Oct 16 – Nov 20 |
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 Smithland L&D, IL weather station, 9 km away (elevation 358 ft (109 m)).
Frost dates near Brookport
- Metropolis Apr 6 · Oct 27
- Golconda Apr 19 · Oct 20
- Joppa Apr 3 · Oct 27
- Grantsburg Apr 14 · Oct 21
- Rosiclare Apr 19 · Oct 20
- Eddyville Apr 14 · Oct 21
- Simpson Apr 14 · Oct 21
- Elizabethtown Apr 19 · Oct 20
- Belknap Apr 3 · Nov 5
- Karnak Apr 3 · Nov 5
Frequently asked questions
When is the last frost in Brookport, IL?
The median last spring frost in Brookport, IL is April 3. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Brookport, IL?
The median first fall frost is October 30, with about a 10% chance of frost before October 17.
How long is the growing season in Brookport, IL?
About 210 days between the median last spring frost and first fall frost.
What planting zone is Brookport, IL?
Brookport, IL is in USDA hardiness zone 7a.