Frost dates for 48647Mio, MI
The average last spring frost in Mio is May 19 and the average first fall frost is October 2, giving a typical growing season of about 136 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Oct 2
- Growing season
- 136 days
Safer after May 31 (1-in-10 risk)
Possible by Sep 17 (1-in-10 risk)
Last frost typically in 198 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 17 · May 31 · Jun 13 | Sep 2 · Sep 20 · Oct 4 | 112 days | 100% |
| Frost / freeze (32°F) | May 1 · May 19 · May 31 | Sep 17 · Oct 2 · Oct 17 | 136 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 22 | Sep 30 · Oct 15 · Nov 2 | 162 days | 100% |
Planting calendar for Mio
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 12 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 22 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 15 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 48647 is matched to the NOAA station Mio Hydro Plt, MI, 0.6 km away, at 960 ft elevation (34 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mio Hydro Plt, MI (used) | 960 ft | May 19 | Oct 2 |
| Mio Wwtp, MI | 1,037 ft | May 20 | Oct 1 |
| Lupton 1S, MI | 908 ft | May 21 | Sep 29 |
| Glennie 2Se, MI | 894 ft | May 19 | Sep 29 |
Frost dates near Mio
- Fairview, MI 48621 · last May 19, first Oct 2
- Luzerne, MI 48636 · last May 19, first Oct 2
- Comins, MI 48619 · last May 19, first Oct 2
- Lewiston, MI 49756 · last May 22, first Sep 27
- Curran, MI 48728 · last May 19, first Oct 2
- Rose City, MI 48654 · last May 21, first Sep 29
- South Branch, MI 48761 · last May 21, first Sep 29
- Lupton, MI 48635 · last May 21, first Sep 29
Frequently asked questions
- When is the last frost in Mio, MI?
- For ZIP code 48647, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Mio Hydro Plt, MI weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Mio, MI?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 17, so tender plants are at risk from that point on.
- How long is the growing season in 48647?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 136 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.