Crystal Falls, MI frost dates
Last spring frostJun 6median date
First fall frostSep 9median date
Growing season95 daysfrost-free
Hardiness zone4aZone 4a
How Crystal Falls compares
- In 8 years out of 10, the last spring frost in Crystal Falls falls between May 23 and July 7, a 45-day window. The first fall frost falls between August 20 and September 27.
- The median last frost is 32 days later than the Michigan median of May 5.
- Its 95-day growing season is among the shortest of the 878 Michigan places with a regular frost season.
- The last frost is 25 days later than the zone 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- The weather station records an average of 203 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 23 |
| 50% (median) | June 6 |
| 10% (safe for tender plants) | July 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 20 |
| 50% (median) | September 9 |
| 90% (late) | September 27 |
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 Crystal Falls, MI
Crystal Falls, MI frost dates — last frost Jun 6, first frost Sep 9, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Mar 14 to Mar 28Transplant outside: May 9 to May 23
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30Sow outdoors: May 9 to Jun 13Plant for fall: Jul 15 to Aug 12
Start indoors: Apr 11 to Apr 25Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 1 to Jul 22
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 25 to May 9Transplant outside: Jun 27 to Jul 11Sow outdoors: Jun 27 to Jul 11
Start indoors: Apr 25 to May 9Transplant outside: Jun 13 to Jun 27
Sow outdoors: Apr 25 to May 16
Sow outdoors: Apr 25 to May 16Plant for fall: Jul 15 to Aug 5
Sow outdoors: May 2 to Jun 13Plant for fall: Jul 29 to Aug 19
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jul 4
Sow outdoors: May 16 to Jun 13
Sow outdoors: May 16 to Jun 13Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 16 to Jun 6
Sow outdoors: May 23 to Jun 20
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 15 to Aug 5
Sow outdoors: Jun 13 to Jul 4
Sow outdoors: Jun 13 to Jun 27
Transplant outside: Jun 20 to Jul 11
Plant for fall: Aug 26 to Sep 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Crystal Falls, MI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 14 – Mar 28 | May 9 – May 23 | — | — |
| Peppers | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Eggplant | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Tomatoes | Apr 11 – Apr 25 | Jun 13 – Jun 27 | — | — |
| Lettuce | Apr 11 – Apr 25 | May 16 – May 30 | May 9 – Jun 13 | Jul 15 – Aug 12 |
| Kale | Apr 11 – Apr 25 | May 9 – May 23 | May 9 – May 23 | Jul 1 – Jul 22 |
| Broccoli | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Cabbage | Apr 11 – Apr 25 | May 16 – May 30 | — | — |
| Cauliflower | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Okra | Apr 25 – May 9 | Jun 27 – Jul 11 | Jun 27 – Jul 11 | — |
| Basil | Apr 25 – May 9 | Jun 13 – Jun 27 | — | — |
| Peas | — | — | Apr 25 – May 16 | — |
| Spinach | — | — | Apr 25 – May 16 | Jul 15 – Aug 5 |
| Radishes | — | — | May 2 – Jun 13 | Jul 29 – Aug 19 |
| Cucumbers | May 9 – May 16 | Jun 20 – Jun 27 | Jun 13 – Jun 27 | — |
| Zucchini & Summer Squash | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 95 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Melons & Watermelon Warning: Your frost-free season is about 95 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 9 – May 16 | Jun 20 – Jul 4 | — | — |
| Carrots | — | — | May 16 – Jun 13 | — |
| Beets | — | — | May 16 – Jun 13 | Jul 1 – Jul 15 |
| Potatoes | — | — | May 16 – Jun 6 | — |
| Swiss Chard | — | — | May 23 – Jun 20 | — |
| Cilantro | — | — | May 23 – Jun 13 | Jul 15 – Aug 5 |
| Green Beans | — | — | Jun 13 – Jul 4 | — |
| Sweet Corn | — | — | Jun 13 – Jun 27 | — |
| Sweet Potatoes Warning: Your frost-free season is about 95 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 20 – Jul 11 | — | — |
| Garlic | — | — | — | Aug 26 – Sep 30 |
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 Amasa 1w, MI weather station, 16 km away (elevation 1,470 ft (448 m)).
Frost dates near Crystal Falls
- Alpha May 24 · Sep 25
- Amasa Jun 6 · Sep 9
- Gaastra Jun 4 · Sep 10
- Channing May 24 · Sep 25
- Stambaugh Jun 4 · Sep 10
- Sagola May 24 · Sep 25
- Caspian Jun 4 · Sep 10
- Iron River Jun 4 · Sep 10
- Iron Mountain May 25 · Sep 24
- Republic frost any month
Frequently asked questions
When is the last frost in Crystal Falls, MI?
The median last spring frost in Crystal Falls, MI is June 6. There is still about a 10% chance of frost after July 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Crystal Falls, MI?
The median first fall frost is September 9, with about a 10% chance of frost before August 20.
How long is the growing season in Crystal Falls, MI?
About 95 days between the median last spring frost and first fall frost.
What planting zone is Crystal Falls, MI?
Crystal Falls, MI is in USDA hardiness zone 4a.