Frost dates for 49328Hopkins, MI
The average last spring frost in Hopkins is May 4 and the average first fall frost is October 15, giving a typical growing season of about 160 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 15
- Growing season
- 160 days
Safer after May 22 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 184 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 1 · May 17 · Jun 1 | Sep 18 · Oct 1 · Oct 14 | 138 days | 100% |
| Frost / freeze (32°F) | Apr 22 · May 4 · May 22 | Sep 30 · Oct 15 · Oct 29 | 160 days | 100% |
| Hard freeze (28°F) | Apr 9 · Apr 24 · May 10 | Oct 11 · Oct 29 · Nov 11 | 184 days | 100% |
Planting calendar for Hopkins
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 3 – Jun 9 |
| Tomatoes | Transplant outdoors | May 20 – Jun 25 |
| Peppers | Start seeds indoors | Apr 3 – May 4 |
| Peppers | Transplant outdoors | Jun 3 – Jul 4 |
| Eggplant | Start seeds indoors | Apr 20 – May 19 |
| Eggplant | Transplant outdoors | Jun 3 – Jul 4 |
| Cucumbers | Sow outdoors | Jun 3 – Jul 5 |
| Summer squash | Sow outdoors | May 20 – Jul 4 |
| Winter squash & pumpkins | Sow outdoors | Jun 3 – Jul 4 |
| Snap beans | Sow outdoors | May 20 – Jul 28 |
| Sweet corn | Sow outdoors | May 20 – Jun 25 |
| Watermelon & cantaloupe | Sow outdoors | Jun 3 – Jul 4 |
| Okra | Sow outdoors | May 27 – Jun 19 |
| Peas | Sow outdoors (spring) | Apr 3 – May 19 |
| Potatoes | Plant outdoors (spring) | Apr 3 – Jun 3 |
| Onions | Start seeds indoors (spring) | Feb 20 – Mar 19 |
| Onions | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (spring) | Mar 16 – Apr 19 |
| Broccoli | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (fall) | Jun 15 – Jun 25 |
| Broccoli | Transplant outdoors (fall) | Jul 15 – Jul 26 |
| Cabbage | Start seeds indoors (spring) | Mar 6 – Apr 3 |
| Cabbage | Transplant outdoors (spring) | Apr 3 – May 4 |
| Cabbage | Start seeds indoors (fall) | Jun 5 – Jul 5 |
| Cabbage | Transplant outdoors (fall) | Jul 5 – Aug 5 |
| Leaf lettuce | Sow outdoors (spring) | Apr 3 – Jun 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 5 – Aug 21 |
| Spinach | Sow outdoors (spring) | Mar 27 – May 10 |
| Spinach | Sow outdoors (fall) | Jul 22 – Aug 26 |
| Radishes | Sow outdoors (spring) | Apr 3 – May 24 |
| Radishes | Sow outdoors (fall) | Jul 5 – Sep 5 |
| Kale | Sow outdoors (spring) | Apr 20 – May 10 |
| Kale | Sow outdoors (fall) | Jun 28 – Aug 5 |
| Carrots | Sow outdoors (spring) | May 4 – Jun 19 |
| Carrots | Sow outdoors (fall) | Jun 5 – Jul 21 |
| Garlic | Plant outdoors (fall) | Oct 5 – Nov 5 |
Where these dates come from
ZIP code 49328 is matched to the NOAA station Allegan 5Ne, MI, 8.3 km away, at 750 ft elevation (35 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Allegan 5Ne, MI (used) | 750 ft | May 4 | Oct 15 |
| Nwsfo Grand Rapids, MI | 775 ft | Apr 30 | Oct 14 |
| Grand Rapids, MI | 778 ft | Apr 29 | Oct 20 |
| Holland Tulip City Ap, MI | 689 ft | Apr 28 | Oct 21 |
Frost dates near Hopkins
- Bradley, MI 49311 · last May 3, first Oct 12
- Dorr, MI 49323 · last Apr 28, first Oct 21
- Wayland, MI 49348 · last Apr 29, first Oct 20
- Shelbyville, MI 49344 · last May 3, first Oct 12
- Moline, MI 49335 · last Apr 29, first Oct 20
- Burnips, MI 49314 · last Apr 28, first Oct 21
- Martin, MI 49070 · last Apr 29, first Oct 20
- Allegan, MI 49010 · last May 7, first Oct 11
Frequently asked questions
- When is the last frost in Hopkins, MI?
- For ZIP code 49328, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Allegan 5Ne, MI weather station. There is a 1-in-10 chance of a frost after May 22.
- When is the first frost in Hopkins, MI?
- The average first fall frost (32°F) is October 15. 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 49328?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 160 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.