Frost dates for 48161 — Monroe, MI
Last spring frostApr 23median date
First fall frostOct 23median date
Growing season183 daysfrost-free
Hardiness zone6bZone 6b
How Monroe compares
- In 8 years out of 10, the last spring frost in Monroe falls between April 8 and May 7, a 29-day window. The first fall frost falls between October 9 and November 5.
- The median last frost is 12 days earlier than the Michigan median of May 5.
- Its 183-day growing season is longer than 95% of the 878 Michigan places with a regular frost season (state median 162 days).
- The last frost is typical for zone 6b, where the median is Apr 22.
- The weather station records an average of 128 nights a year at or below 32°F.
- Compared with Toledo, OH, 26 km away, the last frost here is 3 days later than there and the growing season is 7 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 8 |
| 50% (median) | April 23 |
| 10% (safe for tender plants) | May 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 9 |
| 50% (median) | October 23 |
| 90% (late) | November 5 |
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 Monroe, MI
Frost dates for 48161 — Monroe, MI — last frost Apr 23, first frost Oct 23, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 29 to Feb 12Transplant outside: Mar 26 to Apr 9
Start indoors: Feb 12 to Feb 26Transplant outside: May 7 to May 21
Start indoors: Feb 12 to Feb 26Transplant outside: May 7 to May 21
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 30 to May 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 2 to Apr 16Sow outdoors: Mar 26 to Apr 30Plant for fall: Aug 28 to Sep 25
Start indoors: Feb 26 to Mar 12Transplant outside: Mar 26 to Apr 9Sow outdoors: Mar 26 to Apr 9Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 9 to Apr 23Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 9 to Apr 23Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 12 to Mar 26Transplant outside: May 14 to May 28Sow outdoors: May 14 to May 28
Start indoors: Mar 12 to Mar 26Transplant outside: Apr 30 to May 14
Sow outdoors: Mar 12 to Apr 2Plant for fall: Jul 31 to Aug 21
Sow outdoors: Mar 12 to Apr 2Plant for fall: Aug 28 to Sep 18
Sow outdoors: Mar 19 to Apr 30Plant for fall: Sep 11 to Oct 2
Start indoors: Mar 26 to Apr 2Transplant outside: May 7 to May 14Sow outdoors: Apr 30 to May 14Plant for fall: Aug 7 to Aug 21
Start indoors: Mar 26 to Apr 2Sow outdoors: Apr 30 to May 14Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 26 to Apr 2Sow outdoors: Apr 30 to May 14
Start indoors: Mar 26 to Apr 2Transplant outside: May 7 to May 21
Sow outdoors: Apr 2 to Apr 30Plant for fall: Jul 31 to Aug 14
Sow outdoors: Apr 2 to Apr 30Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 2 to Apr 23
Sow outdoors: Apr 9 to May 7Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 9 to Apr 30Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 30 to May 21Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 30 to May 14
Transplant outside: May 7 to May 28
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Monroe, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 29 – Feb 12 | Mar 26 – Apr 9 | — | — |
| Peppers | Feb 12 – Feb 26 | May 7 – May 21 | — | — |
| Eggplant | Feb 12 – Feb 26 | May 7 – May 21 | — | — |
| Tomatoes | Feb 26 – Mar 12 | Apr 30 – May 14 | — | — |
| Lettuce | Feb 26 – Mar 12 | Apr 2 – Apr 16 | Mar 26 – Apr 30 | Aug 28 – Sep 25 |
| Kale | Feb 26 – Mar 12 | Mar 26 – Apr 9 | Mar 26 – Apr 9 | Aug 14 – Sep 4 |
| Broccoli | Feb 26 – Mar 12 | Apr 9 – Apr 23 | — | Jul 17 – Aug 7 |
| Cabbage | Feb 26 – Mar 12 | Apr 2 – Apr 16 | — | Jul 17 – Aug 7 |
| Cauliflower | Feb 26 – Mar 12 | Apr 9 – Apr 23 | — | Jul 17 – Aug 7 |
| Okra | Mar 12 – Mar 26 | May 14 – May 28 | May 14 – May 28 | — |
| Basil | Mar 12 – Mar 26 | Apr 30 – May 14 | — | — |
| Peas | — | — | Mar 12 – Apr 2 | Jul 31 – Aug 21 |
| Spinach | — | — | Mar 12 – Apr 2 | Aug 28 – Sep 18 |
| Radishes | — | — | Mar 19 – Apr 30 | Sep 11 – Oct 2 |
| Cucumbers | Mar 26 – Apr 2 | May 7 – May 14 | Apr 30 – May 14 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Mar 26 – Apr 2 | — | Apr 30 – May 14 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Mar 26 – Apr 2 | — | Apr 30 – May 14 | — |
| Melons & Watermelon | Mar 26 – Apr 2 | May 7 – May 21 | — | — |
| Carrots | — | — | Apr 2 – Apr 30 | Jul 31 – Aug 14 |
| Beets | — | — | Apr 2 – Apr 30 | Aug 14 – Aug 28 |
| Potatoes | — | — | Apr 2 – Apr 23 | — |
| Swiss Chard | — | — | Apr 9 – May 7 | Aug 14 – Aug 28 |
| Cilantro | — | — | Apr 9 – Apr 30 | Aug 28 – Sep 18 |
| Green Beans | — | — | Apr 30 – May 21 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | Apr 30 – May 14 | — |
| Sweet Potatoes | — | May 7 – May 28 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
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 Monroe, MI weather station, 5 km away (elevation 587 ft (179 m)).
ZIP codes in Monroe: 48161 48162
Frost dates near Monroe
- La Salle Apr 23 · Oct 23
- Luna Pier Apr 23 · Oct 23
- Ida Apr 27 · Oct 21
- Maybee Apr 27 · Oct 20
- Erie Apr 23 · Oct 23
- Samaria Apr 27 · Oct 21
- Dundee Apr 27 · Oct 21
- Newport Apr 27 · Oct 22
Frequently asked questions
When is the last frost in Monroe, MI?
The median last spring frost in Monroe, MI is April 23. There is still about a 10% chance of frost after May 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Monroe, MI?
The median first fall frost is October 23, with about a 10% chance of frost before October 9.
How long is the growing season in Monroe, MI?
About 183 days between the median last spring frost and first fall frost.
What planting zone is Monroe, MI?
Monroe, MI is in USDA hardiness zone 6b.