Trenary, MI frost dates
Last spring frostMay 27median date
First fall frostSep 28median date
Growing season124 daysfrost-free
Hardiness zone5aZone 5a
How Trenary compares
- In 8 years out of 10, the last spring frost in Trenary falls between May 11 and June 12, a 32-day window. The first fall frost falls between September 9 and October 12.
- The median last frost is 22 days later than the Michigan median of May 5.
- Its 124-day growing season is longer than 5% of the 878 Michigan places with a regular frost season (state median 162 days).
- The last frost is 24 days later 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 186 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 11 |
| 50% (median) | May 27 |
| 10% (safe for tender plants) | June 12 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 9 |
| 50% (median) | September 28 |
| 90% (late) | October 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 Trenary, MI
Trenary, MI frost dates — last frost May 27, first frost Sep 28, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Mar 4 to Mar 18Transplant outside: Apr 29 to May 13
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 1 to Apr 15Transplant outside: Jun 3 to Jun 17
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Sow outdoors: Apr 29 to Jun 3Plant for fall: Aug 3 to Aug 31
Start indoors: Apr 1 to Apr 15Transplant outside: Apr 29 to May 13Sow outdoors: Apr 29 to May 13Plant for fall: Jul 20 to Aug 10
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 17 to Jul 1Sow outdoors: Jun 17 to Jul 1
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 15 to May 6Plant for fall: Jul 6 to Jul 27
Sow outdoors: Apr 15 to May 6Plant for fall: Aug 3 to Aug 24
Sow outdoors: Apr 22 to Jun 3Plant for fall: Aug 17 to Sep 7
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 17Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 13 to Jul 27
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 6 to May 27
Sow outdoors: May 13 to Jun 10Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 13 to Jun 3Plant for fall: Aug 3 to Aug 24
Sow outdoors: Jun 3 to Jun 24Plant for fall: Jul 13 to Jul 27
Sow outdoors: Jun 3 to Jun 17
Transplant outside: Jun 10 to Jul 1
Plant for fall: Sep 14 to Oct 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Trenary, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 4 – Mar 18 | Apr 29 – May 13 | — | — |
| Peppers | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Eggplant | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Tomatoes | Apr 1 – Apr 15 | Jun 3 – Jun 17 | — | — |
| Lettuce | Apr 1 – Apr 15 | May 6 – May 20 | Apr 29 – Jun 3 | Aug 3 – Aug 31 |
| Kale | Apr 1 – Apr 15 | Apr 29 – May 13 | Apr 29 – May 13 | Jul 20 – Aug 10 |
| Broccoli | Apr 1 – Apr 15 | May 13 – May 27 | — | Jun 22 – Jul 13 |
| Cabbage | Apr 1 – Apr 15 | May 6 – May 20 | — | Jun 22 – Jul 13 |
| Cauliflower | Apr 1 – Apr 15 | May 13 – May 27 | — | Jun 22 – Jul 13 |
| Okra | Apr 15 – Apr 29 | Jun 17 – Jul 1 | Jun 17 – Jul 1 | — |
| Basil | Apr 15 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Peas | — | — | Apr 15 – May 6 | Jul 6 – Jul 27 |
| Spinach | — | — | Apr 15 – May 6 | Aug 3 – Aug 24 |
| Radishes | — | — | Apr 22 – Jun 3 | Aug 17 – Sep 7 |
| Cucumbers | Apr 29 – May 6 | Jun 10 – Jun 17 | Jun 3 – Jun 17 | Jul 13 – Jul 27 |
| Zucchini & Summer Squash | Apr 29 – May 6 | — | Jun 3 – Jun 17 | Jul 20 – Aug 3 |
| Winter Squash & Pumpkins | Apr 29 – May 6 | — | Jun 3 – Jun 17 | — |
| Melons & Watermelon | Apr 29 – May 6 | Jun 10 – Jun 24 | — | — |
| Carrots | — | — | May 6 – Jun 3 | Jul 6 – Jul 20 |
| Beets | — | — | May 6 – Jun 3 | Jul 20 – Aug 3 |
| Potatoes | — | — | May 6 – May 27 | — |
| Swiss Chard | — | — | May 13 – Jun 10 | Jul 20 – Aug 3 |
| Cilantro | — | — | May 13 – Jun 3 | Aug 3 – Aug 24 |
| Green Beans | — | — | Jun 3 – Jun 24 | Jul 13 – Jul 27 |
| Sweet Corn | — | — | Jun 3 – Jun 17 | — |
| Sweet Potatoes | — | Jun 10 – Jul 1 | — | — |
| Garlic | — | — | — | Sep 14 – Oct 19 |
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 Chatham 1 Se, MI weather station, 16 km away (elevation 876 ft (267 m)).
Frost dates near Trenary
- Chatham May 30 · Sep 27
- Eben Junction May 30 · Sep 27
- Rumely May 30 · Sep 27
- Rock May 18 · Oct 4
- Perkins May 18 · Oct 4
- Deerton May 30 · Sep 27
- Au Train May 30 · Sep 27
- Skandia May 13 · Oct 2
- Munising May 16 · Oct 14
- Wetmore May 16 · Oct 14
Frequently asked questions
When is the last frost in Trenary, MI?
The median last spring frost in Trenary, MI is May 27. There is still about a 10% chance of frost after June 12, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Trenary, MI?
The median first fall frost is September 28, with about a 10% chance of frost before September 9.
How long is the growing season in Trenary, MI?
About 124 days between the median last spring frost and first fall frost.
What planting zone is Trenary, MI?
Trenary, MI is in USDA hardiness zone 5a.