Romulus, MI frost dates
Last spring frostApr 20median date
First fall frostOct 27median date
Growing season190 daysfrost-free
Hardiness zone6bZone 6b
How Romulus compares
- In 8 years out of 10, the last spring frost in Romulus falls between April 6 and May 8, a 32-day window. The first fall frost falls between October 14 and November 9.
- The median last frost is 15 days earlier than the Michigan median of May 5.
- Its 190-day growing season is longer than 96% 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 120 nights a year at or below 32°F.
- Romulus shares its weather station with Westland, MI, 10 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 6 |
| 50% (median) | April 20 |
| 10% (safe for tender plants) | May 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 14 |
| 50% (median) | October 27 |
| 90% (late) | November 9 |
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 Romulus, MI
Romulus, MI frost dates — last frost Apr 20, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 26 to Feb 9Transplant outside: Mar 23 to Apr 6
Start indoors: Feb 9 to Feb 23Transplant outside: May 4 to May 18
Start indoors: Feb 9 to Feb 23Transplant outside: May 4 to May 18
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 30 to Apr 13Sow outdoors: Mar 23 to Apr 27Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 23 to Apr 6Sow outdoors: Mar 23 to Apr 6Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 9 to Mar 23Transplant outside: May 11 to May 25Sow outdoors: May 11 to May 25
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 27 to May 11
Sow outdoors: Mar 9 to Mar 30Plant for fall: Aug 4 to Aug 25
Sow outdoors: Mar 9 to Mar 30Plant for fall: Sep 1 to Sep 22
Sow outdoors: Mar 16 to Apr 27Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 23 to Mar 30Transplant outside: May 4 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 23 to Mar 30Sow outdoors: Apr 27 to May 11Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 23 to Mar 30Sow outdoors: Apr 27 to May 11
Start indoors: Mar 23 to Mar 30Transplant outside: May 4 to May 18
Sow outdoors: Mar 30 to Apr 27Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 30 to Apr 27Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 30 to Apr 20
Sow outdoors: Apr 6 to May 4Plant for fall: Aug 18 to Sep 1
Sow outdoors: Apr 6 to Apr 27Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 27 to May 18Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 27 to May 11
Transplant outside: May 4 to May 25
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Romulus, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 26 – Feb 9 | Mar 23 – Apr 6 | — | — |
| Peppers | Feb 9 – Feb 23 | May 4 – May 18 | — | — |
| Eggplant | Feb 9 – Feb 23 | May 4 – May 18 | — | — |
| Tomatoes | Feb 23 – Mar 9 | Apr 27 – May 11 | — | — |
| Lettuce | Feb 23 – Mar 9 | Mar 30 – Apr 13 | Mar 23 – Apr 27 | Sep 1 – Sep 29 |
| Kale | Feb 23 – Mar 9 | Mar 23 – Apr 6 | Mar 23 – Apr 6 | Aug 18 – Sep 8 |
| Broccoli | Feb 23 – Mar 9 | Apr 6 – Apr 20 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 23 – Mar 9 | Mar 30 – Apr 13 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 23 – Mar 9 | Apr 6 – Apr 20 | — | Jul 21 – Aug 11 |
| Okra | Mar 9 – Mar 23 | May 11 – May 25 | May 11 – May 25 | — |
| Basil | Mar 9 – Mar 23 | Apr 27 – May 11 | — | — |
| Peas | — | — | Mar 9 – Mar 30 | Aug 4 – Aug 25 |
| Spinach | — | — | Mar 9 – Mar 30 | Sep 1 – Sep 22 |
| Radishes | — | — | Mar 16 – Apr 27 | Sep 15 – Oct 6 |
| Cucumbers | Mar 23 – Mar 30 | May 4 – May 11 | Apr 27 – May 11 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 23 – Mar 30 | — | Apr 27 – May 11 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 23 – Mar 30 | — | Apr 27 – May 11 | — |
| Melons & Watermelon | Mar 23 – Mar 30 | May 4 – May 18 | — | — |
| Carrots | — | — | Mar 30 – Apr 27 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 30 – Apr 27 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 30 – Apr 20 | — |
| Swiss Chard | — | — | Apr 6 – May 4 | Aug 18 – Sep 1 |
| Cilantro | — | — | Apr 6 – Apr 27 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 27 – May 18 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 27 – May 11 | — |
| Sweet Potatoes | — | May 4 – May 25 | — | — |
| Garlic | — | — | — | Oct 13 – Nov 17 |
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 Detroit Metro Ap, MI weather station, 6 km away (elevation 630 ft (192 m)).
Frost dates near Romulus
- Wayne Apr 20 · Oct 27
- Belleville Apr 24 · Oct 24
- New Boston Apr 20 · Oct 27
- Westland Apr 20 · Oct 27
- Inkster May 1 · Oct 15
- Taylor Apr 20 · Oct 27
- Canton Apr 24 · Oct 24
- Riverview Apr 20 · Oct 27
- Dearborn Heights May 1 · Oct 15
- Garden City May 1 · Oct 15
Frequently asked questions
When is the last frost in Romulus, MI?
The median last spring frost in Romulus, MI is April 20. There is still about a 10% chance of frost after May 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Romulus, MI?
The median first fall frost is October 27, with about a 10% chance of frost before October 14.
How long is the growing season in Romulus, MI?
About 190 days between the median last spring frost and first fall frost.
What planting zone is Romulus, MI?
Romulus, MI is in USDA hardiness zone 6b.