Saint Ignace, MI frost dates
Last spring frostMay 23median date
First fall frostSep 30median date
Growing season130 daysfrost-free
Hardiness zone5bZone 5b
How Saint Ignace compares
- In 8 years out of 10, the last spring frost in Saint Ignace falls between May 6 and June 6, a 31-day window. The first fall frost falls between September 15 and October 13.
- The median last frost is 18 days later than the Michigan median of May 5.
- Its 130-day growing season is longer than 10% of the 878 Michigan places with a regular frost season (state median 162 days).
- The last frost is 22 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 182 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 6 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 15 |
| 50% (median) | September 30 |
| 90% (late) | October 13 |
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 Saint Ignace, MI
Saint Ignace, MI frost dates — last frost May 23, first frost Sep 30, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Aug 5 to Sep 2
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 22 to Aug 12
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 24 to Jul 15
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 24 to Jul 15
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 24 to Jul 15
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 8 to Jul 29
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 5 to Aug 26
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 19 to Sep 9
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 15 to Jul 29
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 22 to Aug 5
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jul 8 to Jul 22
Sow outdoors: May 2 to May 30Plant for fall: Jul 22 to Aug 5
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 22 to Aug 5
Sow outdoors: May 9 to May 30Plant for fall: Aug 5 to Aug 26
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 16 to Oct 21
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Saint Ignace, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Aug 5 – Sep 2 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 22 – Aug 12 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 24 – Jul 15 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 24 – Jul 15 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 24 – Jul 15 |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jul 8 – Jul 29 |
| Spinach | — | — | Apr 11 – May 2 | Aug 5 – Aug 26 |
| Radishes | — | — | Apr 18 – May 30 | Aug 19 – Sep 9 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 15 – Jul 29 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 22 – Aug 5 |
| Winter Squash & Pumpkins | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jul 8 – Jul 22 |
| Beets | — | — | May 2 – May 30 | Jul 22 – Aug 5 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 22 – Aug 5 |
| Cilantro | — | — | May 9 – May 30 | Aug 5 – Aug 26 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 15 – Jul 29 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 16 – Oct 21 |
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 Moran, MI weather station, 11 km away (elevation 696 ft (212 m)).
Frost dates near Saint Ignace
- Mackinac Island May 16 · Oct 13
- Hessel Jun 1 · Sep 21
- Moran May 23 · Sep 30
- Mackinaw City May 7 · Oct 23
- Cedarville May 31 · Sep 25
- Carp Lake May 7 · Oct 23
- Rudyard May 24 · Oct 1
- Pickford May 31 · Sep 25
- Trout Lake May 21 · Oct 1
- Pointe Aux Pins May 11 · Oct 11
Frequently asked questions
When is the last frost in Saint Ignace, MI?
The median last spring frost in Saint Ignace, MI is May 23. There is still about a 10% chance of frost after June 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Saint Ignace, MI?
The median first fall frost is September 30, with about a 10% chance of frost before September 15.
How long is the growing season in Saint Ignace, MI?
About 130 days between the median last spring frost and first fall frost.
What planting zone is Saint Ignace, MI?
Saint Ignace, MI is in USDA hardiness zone 5b.