Frost dates for 48047New Baltimore, MI
The average last spring frost in New Baltimore is April 30 and the average first fall frost is October 24, giving a typical growing season of about 174 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 30
- Average first fall frost
- Oct 24
- Growing season
- 174 days
Safer after May 15 (1-in-10 risk)
Possible by Oct 7 (1-in-10 risk)
Last frost typically in 179 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 28 · May 11 · May 28 | Sep 26 · Oct 9 · Oct 24 | 150 days | 100% |
| Frost / freeze (32°F) | Apr 16 · Apr 30 · May 15 | Oct 7 · Oct 24 · Nov 3 | 174 days | 100% |
| Hard freeze (28°F) | Apr 3 · Apr 18 · May 3 | Oct 20 · Nov 3 · Nov 15 | 196 days | 100% |
Planting calendar for New Baltimore
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 | Mar 30 – Jun 5 |
| Tomatoes | Transplant outdoors | May 16 – Jul 4 |
| Peppers | Start seeds indoors | Mar 30 – Apr 30 |
| Peppers | Transplant outdoors | May 30 – Jun 30 |
| Eggplant | Start seeds indoors | Apr 16 – May 15 |
| Eggplant | Transplant outdoors | May 30 – Jun 30 |
| Cucumbers | Sow outdoors | May 30 – Jul 14 |
| Summer squash | Sow outdoors | May 16 – Jun 30 |
| Winter squash & pumpkins | Sow outdoors | May 30 – Jun 30 |
| Snap beans | Sow outdoors | May 16 – Aug 6 |
| Sweet corn | Sow outdoors | May 16 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 30 – Jun 30 |
| Okra | Sow outdoors | May 23 – Jun 15 |
| Peas | Sow outdoors (spring) | Mar 30 – May 15 |
| Potatoes | Plant outdoors (spring) | Mar 30 – May 30 |
| Onions | Start seeds indoors (spring) | Feb 16 – Mar 15 |
| Onions | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (spring) | Mar 12 – Apr 15 |
| Broccoli | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Mar 2 – Mar 30 |
| Cabbage | Transplant outdoors (spring) | Mar 30 – Apr 30 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 30 – Jun 15 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 23 – May 6 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 30 – May 20 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Apr 16 – May 6 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 48047 is matched to the NOAA station Mt Clemens Ang Base, MI, 8 km away, at 580 ft elevation (4 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mt Clemens Ang Base, MI (used) | 580 ft | Apr 30 | Oct 24 |
| Algonac Wwtp, MI | 580 ft | May 3 | Oct 18 |
| Richmond 4 Nnw, MI | 765 ft | May 1 | Oct 20 |
| Grosse Pointe Farms, MI | 613 ft | Apr 29 | Oct 22 |
Frost dates near New Baltimore
- New Baltimore, MI 48051 · last Apr 30, first Oct 24
- New Haven, MI 48048 · last Apr 30, first Oct 24
- Fair Haven, MI 48023 · last Apr 30, first Oct 24
- Harrison Township, MI 48045 · last Apr 30, first Oct 24
- Macomb, MI 48044 · last Apr 30, first Oct 24
- Mount Clemens, MI 48046 · last Apr 30, first Oct 24
- Casco, MI 48064 · last May 1, first Oct 20
- Clinton Township, MI 48036 · last Apr 30, first Oct 24
Frequently asked questions
- When is the last frost in New Baltimore, MI?
- For ZIP code 48047, the average last spring frost (32°F) is April 30, based on NOAA 1991-2020 climate normals for the Mt Clemens Ang Base, MI weather station. There is a 1-in-10 chance of a frost after May 15.
- When is the first frost in New Baltimore, MI?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 7, so tender plants are at risk from that point on.
- How long is the growing season in 48047?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 174 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.