Frost dates for 49806Au Train, MI
The average last spring frost in Au Train is May 16 and the average first fall frost is October 14, giving a typical growing season of about 148 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 16
- Average first fall frost
- Oct 14
- Growing season
- 148 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 201 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 15 · May 30 · Jun 12 | Sep 17 · Oct 1 · Oct 14 | 124 days | 100% |
| Frost / freeze (32°F) | May 1 · May 16 · Jun 2 | Sep 30 · Oct 14 · Oct 30 | 148 days | 100% |
| Hard freeze (28°F) | Apr 19 · May 3 · May 20 | Oct 11 · Oct 28 · Nov 11 | 174 days | 100% |
Planting calendar for Au Train
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 15 – Jun 21 |
| Tomatoes | Transplant outdoors | Jun 1 – Jun 24 |
| Peppers | Start seeds indoors | Apr 15 – May 16 |
| Peppers | Transplant outdoors | Jun 15 – Jul 16 |
| Eggplant | Start seeds indoors | May 2 – May 31 |
| Eggplant | Transplant outdoors | Jun 15 – Jul 16 |
| Cucumbers | Sow outdoors | Jun 15 – Jul 4 |
| Summer squash | Sow outdoors | Jun 1 – Jul 16 |
| Winter squash & pumpkins | Sow outdoors | Jun 15 – Jul 16 |
| Snap beans | Sow outdoors | Jun 1 – Jul 27 |
| Sweet corn | Sow outdoors | Jun 1 – Jun 24 |
| Watermelon & cantaloupe | Sow outdoors | Jun 15 – Jul 16 |
| Okra | Sow outdoors | Jun 8 – Jul 1 |
| Peas | Sow outdoors (spring) | Apr 15 – May 31 |
| Potatoes | Plant outdoors (spring) | Apr 15 – Jun 15 |
| Onions | Start seeds indoors (spring) | Mar 4 – Mar 31 |
| Onions | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (spring) | Mar 28 – May 1 |
| Broccoli | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (fall) | Jun 14 – Jun 24 |
| Broccoli | Transplant outdoors (fall) | Jul 14 – Jul 25 |
| Cabbage | Start seeds indoors (spring) | Mar 18 – Apr 15 |
| Cabbage | Transplant outdoors (spring) | Apr 15 – May 16 |
| Cabbage | Start seeds indoors (fall) | Jun 4 – Jul 4 |
| Cabbage | Transplant outdoors (fall) | Jul 4 – Aug 4 |
| Leaf lettuce | Sow outdoors (spring) | Apr 15 – Jul 1 |
| Leaf lettuce | Sow outdoors (fall) | Jul 4 – Aug 20 |
| Spinach | Sow outdoors (spring) | Apr 8 – May 22 |
| Spinach | Sow outdoors (fall) | Jul 21 – Aug 25 |
| Radishes | Sow outdoors (spring) | Apr 15 – Jun 5 |
| Radishes | Sow outdoors (fall) | Jul 4 – Sep 4 |
| Kale | Sow outdoors (spring) | May 2 – May 22 |
| Kale | Sow outdoors (fall) | Jun 27 – Aug 4 |
| Carrots | Sow outdoors (spring) | May 16 – Jul 1 |
| Carrots | Sow outdoors (fall) | Jun 4 – Jul 20 |
| Garlic | Plant outdoors (fall) | Oct 4 – Nov 4 |
Where these dates come from
ZIP code 49806 is matched to the NOAA station Munising, MI, 19.4 km away, at 680 ft elevation (37 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Munising, MI (used) | 680 ft | May 16 | Oct 14 |
| Chatham Exp Farm 2, MI | 870 ft | May 30 | Sep 27 |
| Chatham 1 Se, MI | 875 ft | May 27 | Sep 28 |
| Munsing Lakeshore, MI | 612 ft | May 23 | Oct 10 |
Frost dates near Au Train
- Deerton, MI 49822 · last May 30, first Sep 27
- Chatham, MI 49816 · last May 30, first Sep 27
- Eben Junction, MI 49825 · last May 30, first Sep 27
- Rumely, MI 49826 · last May 30, first Sep 27
- Munising, MI 49862 · last May 16, first Oct 14
- Wetmore, MI 49895 · last May 16, first Oct 14
- Skandia, MI 49885 · last May 13, first Oct 2
- Trenary, MI 49891 · last May 27, first Sep 28
Frequently asked questions
- When is the last frost in Au Train, MI?
- For ZIP code 49806, the average last spring frost (32°F) is May 16, based on NOAA 1991-2020 climate normals for the Munising, MI weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Au Train, MI?
- The average first fall frost (32°F) is October 14. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 49806?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 148 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.