Frost dates for 48433Flushing, MI
The average last spring frost in Flushing is May 3 and the average first fall frost is October 13, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 3
- Average first fall frost
- Oct 13
- Growing season
- 162 days
Safer after May 20 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 182 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) | Apr 29 · May 14 · May 29 | Sep 20 · Oct 2 · Oct 13 | 141 days | 100% |
| Frost / freeze (32°F) | Apr 20 · May 3 · May 20 | Sep 30 · Oct 13 · Oct 27 | 162 days | 100% |
| Hard freeze (28°F) | Apr 8 · Apr 22 · May 9 | Oct 12 · Oct 27 · Nov 9 | 186 days | 100% |
Planting calendar for Flushing
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 2 – Jun 8 |
| Tomatoes | Transplant outdoors | May 19 – Jun 23 |
| Peppers | Start seeds indoors | Apr 2 – May 3 |
| Peppers | Transplant outdoors | Jun 2 – Jul 3 |
| Eggplant | Start seeds indoors | Apr 19 – May 18 |
| Eggplant | Transplant outdoors | Jun 2 – Jul 3 |
| Cucumbers | Sow outdoors | Jun 2 – Jul 3 |
| Summer squash | Sow outdoors | May 19 – Jul 3 |
| Winter squash & pumpkins | Sow outdoors | Jun 2 – Jul 3 |
| Snap beans | Sow outdoors | May 19 – Jul 26 |
| Sweet corn | Sow outdoors | May 19 – Jun 23 |
| Watermelon & cantaloupe | Sow outdoors | Jun 2 – Jul 3 |
| Okra | Sow outdoors | May 26 – Jun 18 |
| Peas | Sow outdoors (spring) | Apr 2 – May 18 |
| Potatoes | Plant outdoors (spring) | Apr 2 – Jun 2 |
| Onions | Start seeds indoors (spring) | Feb 19 – Mar 18 |
| Onions | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (spring) | Mar 15 – Apr 18 |
| Broccoli | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (fall) | Jun 13 – Jun 23 |
| Broccoli | Transplant outdoors (fall) | Jul 13 – Jul 24 |
| Cabbage | Start seeds indoors (spring) | Mar 5 – Apr 2 |
| Cabbage | Transplant outdoors (spring) | Apr 2 – May 3 |
| Cabbage | Start seeds indoors (fall) | Jun 3 – Jul 3 |
| Cabbage | Transplant outdoors (fall) | Jul 3 – Aug 3 |
| Leaf lettuce | Sow outdoors (spring) | Apr 2 – Jun 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 3 – Aug 19 |
| Spinach | Sow outdoors (spring) | Mar 26 – May 9 |
| Spinach | Sow outdoors (fall) | Jul 20 – Aug 24 |
| Radishes | Sow outdoors (spring) | Apr 2 – May 23 |
| Radishes | Sow outdoors (fall) | Jul 3 – Sep 3 |
| Kale | Sow outdoors (spring) | Apr 19 – May 9 |
| Kale | Sow outdoors (fall) | Jun 26 – Aug 3 |
| Carrots | Sow outdoors (spring) | May 3 – Jun 18 |
| Carrots | Sow outdoors (fall) | Jun 3 – Jul 19 |
| Garlic | Plant outdoors (fall) | Oct 3 – Nov 3 |
Where these dates come from
ZIP code 48433 is matched to the NOAA station Flint 7W, MI, 7 km away, at 679 ft elevation (62 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Flint 7W, MI (used) | 679 ft | May 3 | Oct 13 |
| Flint Bishop Intl Ap, MI | 770 ft | May 6 | Oct 10 |
| Durand Wwtp, MI | 770 ft | May 3 | Oct 11 |
| Burton 4N, MI | 757 ft | May 8 | Oct 5 |
Frost dates near Flushing
- Flint, MI 48557 · last May 3, first Oct 13
- Montrose, MI 48457 · last May 3, first Oct 13
- Mount Morris, MI 48458 · last May 3, first Oct 13
- Lennon, MI 48449 · last May 3, first Oct 11
- New Lothrop, MI 48460 · last May 3, first Oct 13
- Swartz Creek, MI 48473 · last May 6, first Oct 10
- Clio, MI 48420 · last May 3, first Oct 13
- Corunna, MI 48817 · last May 1, first Oct 15
Frequently asked questions
- When is the last frost in Flushing, MI?
- For ZIP code 48433, the average last spring frost (32°F) is May 3, based on NOAA 1991-2020 climate normals for the Flint 7W, MI weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Flushing, MI?
- The average first fall frost (32°F) is October 13. 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 48433?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.