Frost dates for 49765Onaway, MI
The average last spring frost in Onaway is May 22 and the average first fall frost is October 2, giving a typical growing season of about 135 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Oct 2
- Growing season
- 135 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 16 (1-in-10 risk)
Last frost typically in 202 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 21 · Jun 2 · Jun 16 | Sep 2 · Sep 19 · Oct 3 | 108 days | 100% |
| Frost / freeze (32°F) | May 3 · May 22 · Jun 2 | Sep 16 · Oct 2 · Oct 16 | 135 days | 100% |
| Hard freeze (28°F) | Apr 25 · May 7 · May 24 | Sep 26 · Oct 16 · Nov 1 | 160 days | 100% |
Planting calendar for Onaway
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 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 12 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 22 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 15 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 49765 is matched to the NOAA station Onaway 4N, MI, 8.3 km away, at 745 ft elevation (147 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Onaway 4N, MI (used) | 745 ft | May 22 | Oct 2 |
| Vanderbilt 11Ene, MI | 905 ft | Jun 7 | Sep 14 |
| Rogers City, MI | 615 ft | May 10 | Oct 14 |
| Atlanta 5 Wnw, MI | 1,180 ft | May 11 | Oct 6 |
Frost dates near Onaway
- Tower, MI 49792 · last May 22, first Oct 2
- Millersburg, MI 49759 · last May 22, first Oct 2
- Afton, MI 49705 · last Jun 7, first Sep 14
- Hawks, MI 49743 · last May 10, first Oct 14
- Rogers City, MI 49779 · last May 10, first Oct 14
- Wolverine, MI 49799 · last Jun 7, first Sep 14
- Indian River, MI 49749 · last May 31, first Sep 18
- Topinabee, MI 49791 · last May 31, first Sep 18
Frequently asked questions
- When is the last frost in Onaway, MI?
- For ZIP code 49765, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Onaway 4N, MI weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Onaway, MI?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 16, so tender plants are at risk from that point on.
- How long is the growing season in 49765?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 135 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.