Union Pier, MI frost dates
Last spring frostApr 19median date
First fall frostOct 27median date
Growing season191 daysfrost-free
Hardiness zone6bZone 6b
How Union Pier compares
- In 8 years out of 10, the last spring frost in Union Pier falls between April 5 and May 3, a 28-day window. The first fall frost falls between October 14 and November 9.
- The median last frost is 16 days earlier than the Michigan median of May 5.
- Its 191-day growing season is longer than 97% 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 119 nights a year at or below 32°F.
- Compared with South Bend, IN, 40 km away, the last frost here is 4 days earlier than there and the growing season is 8 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 5 |
| 50% (median) | April 19 |
| 10% (safe for tender plants) | May 3 |
| 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 Union Pier, MI
Union Pier, MI frost dates — last frost Apr 19, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 25 to Feb 8Transplant outside: Mar 22 to Apr 5
Start indoors: Feb 8 to Feb 22Transplant outside: May 3 to May 17
Start indoors: Feb 8 to Feb 22Transplant outside: May 3 to May 17
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 26 to May 10
Start indoors: Feb 22 to Mar 8Transplant outside: Mar 29 to Apr 12Sow outdoors: Mar 22 to Apr 26Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 22 to Mar 8Transplant outside: Mar 22 to Apr 5Sow outdoors: Mar 22 to Apr 5Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 5 to Apr 19Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 22 to Mar 8Transplant outside: Mar 29 to Apr 12Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 5 to Apr 19Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 8 to Mar 22Transplant outside: May 10 to May 24Sow outdoors: May 10 to May 24
Start indoors: Mar 8 to Mar 22Transplant outside: Apr 26 to May 10
Sow outdoors: Mar 8 to Mar 29Plant for fall: Aug 4 to Aug 25
Sow outdoors: Mar 8 to Mar 29Plant for fall: Sep 1 to Sep 22
Sow outdoors: Mar 15 to Apr 26Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 22 to Mar 29Transplant outside: May 3 to May 10Sow outdoors: Apr 26 to May 10Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 22 to Mar 29Sow outdoors: Apr 26 to May 10Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 22 to Mar 29Sow outdoors: Apr 26 to May 10
Start indoors: Mar 22 to Mar 29Transplant outside: May 3 to May 17
Sow outdoors: Mar 29 to Apr 26Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 29 to Apr 26Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 29 to Apr 19
Sow outdoors: Apr 5 to May 3Plant for fall: Aug 18 to Sep 1
Sow outdoors: Apr 5 to Apr 26Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 26 to May 17Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 26 to May 10
Transplant outside: May 3 to May 24
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Union Pier, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 25 – Feb 8 | Mar 22 – Apr 5 | — | — |
| Peppers | Feb 8 – Feb 22 | May 3 – May 17 | — | — |
| Eggplant | Feb 8 – Feb 22 | May 3 – May 17 | — | — |
| Tomatoes | Feb 22 – Mar 8 | Apr 26 – May 10 | — | — |
| Lettuce | Feb 22 – Mar 8 | Mar 29 – Apr 12 | Mar 22 – Apr 26 | Sep 1 – Sep 29 |
| Kale | Feb 22 – Mar 8 | Mar 22 – Apr 5 | Mar 22 – Apr 5 | Aug 18 – Sep 8 |
| Broccoli | Feb 22 – Mar 8 | Apr 5 – Apr 19 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 22 – Mar 8 | Mar 29 – Apr 12 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 22 – Mar 8 | Apr 5 – Apr 19 | — | Jul 21 – Aug 11 |
| Okra | Mar 8 – Mar 22 | May 10 – May 24 | May 10 – May 24 | — |
| Basil | Mar 8 – Mar 22 | Apr 26 – May 10 | — | — |
| Peas | — | — | Mar 8 – Mar 29 | Aug 4 – Aug 25 |
| Spinach | — | — | Mar 8 – Mar 29 | Sep 1 – Sep 22 |
| Radishes | — | — | Mar 15 – Apr 26 | Sep 15 – Oct 6 |
| Cucumbers | Mar 22 – Mar 29 | May 3 – May 10 | Apr 26 – May 10 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 22 – Mar 29 | — | Apr 26 – May 10 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 22 – Mar 29 | — | Apr 26 – May 10 | — |
| Melons & Watermelon | Mar 22 – Mar 29 | May 3 – May 17 | — | — |
| Carrots | — | — | Mar 29 – Apr 26 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 29 – Apr 26 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 29 – Apr 19 | — |
| Swiss Chard | — | — | Apr 5 – May 3 | Aug 18 – Sep 1 |
| Cilantro | — | — | Apr 5 – Apr 26 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 26 – May 17 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 26 – May 10 | — |
| Sweet Potatoes | — | May 3 – May 24 | — | — |
| 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 Laporte, IN weather station, 24 km away (elevation 810 ft (247 m)).
Frost dates near Union Pier
- Lakeside Apr 19 · Oct 27
- New Buffalo Apr 19 · Oct 27
- Three Oaks Apr 19 · Oct 27
- Harbert Apr 27 · Oct 25
- Sawyer Apr 27 · Oct 25
- New Troy Apr 27 · Oct 25
- Galien Apr 27 · Oct 25
- Bridgman May 5 · Oct 15
- Baroda May 5 · Oct 15
- Stevensville May 5 · Oct 15
Frequently asked questions
When is the last frost in Union Pier, MI?
The median last spring frost in Union Pier, MI is April 19. There is still about a 10% chance of frost after May 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Union Pier, 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 Union Pier, MI?
About 191 days between the median last spring frost and first fall frost.
What planting zone is Union Pier, MI?
Union Pier, MI is in USDA hardiness zone 6b.