Frost dates for 48758Richville, MI
The average last spring frost in Richville is May 9 and the average first fall frost is October 7, giving a typical growing season of about 150 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 7
- Growing season
- 150 days
Safer after May 24 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 188 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 5 · May 21 · Jun 4 | Sep 14 · Sep 27 · Oct 9 | 127 days | 100% |
| Frost / freeze (32°F) | Apr 26 · May 9 · May 24 | Sep 24 · Oct 7 · Oct 21 | 150 days | 100% |
| Hard freeze (28°F) | Apr 16 · Apr 30 · May 15 | Oct 4 · Oct 21 · Nov 3 | 172 days | 100% |
Planting calendar for Richville
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 17 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 27 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 20 |
| Sweet corn | Sow outdoors | May 25 – Jun 17 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 7 – Jun 17 |
| Broccoli | Transplant outdoors (fall) | Jul 7 – Jul 18 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 28 – Jun 27 |
| Cabbage | Transplant outdoors (fall) | Jun 27 – Jul 28 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 27 – Aug 13 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 14 – Aug 18 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 27 – Aug 28 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 20 – Jul 28 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 28 – Jul 13 |
| Garlic | Plant outdoors (fall) | Sep 27 – Oct 28 |
Where these dates come from
ZIP code 48758 is matched to the NOAA station Vassar, MI, 8.9 km away, at 630 ft elevation (10 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Vassar, MI (used) | 630 ft | May 9 | Oct 7 |
| Frankenmuth 1Se, MI | 635 ft | May 3 | Oct 12 |
| Saginaw #3, MI | 600 ft | Apr 29 | Oct 21 |
| Caro Wwtp, MI | 690 ft | May 7 | Oct 9 |
Frost dates near Richville
- Reese, MI 48757 · last Apr 29, first Oct 21
- Vassar, MI 48768 · last May 9, first Oct 7
- Frankenmuth, MI 48734 · last May 3, first Oct 12
- Fairgrove, MI 48733 · last May 7, first Oct 9
- Munger, MI 48747 · last Apr 27, first Oct 20
- Bridgeport, MI 48722 · last Apr 29, first Oct 21
- Millington, MI 48746 · last May 7, first Oct 9
- Birch Run, MI 48415 · last Apr 29, first Oct 21
Frequently asked questions
- When is the last frost in Richville, MI?
- For ZIP code 48758, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Vassar, MI weather station. There is a 1-in-10 chance of a frost after May 24.
- When is the first frost in Richville, MI?
- The average first fall frost (32°F) is October 7. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 48758?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 150 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.