Frost dates for 49416Glenn, MI
The average last spring frost in Glenn is April 17 and the average first fall frost is November 5, giving a typical growing season of about 201 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 17
- Average first fall frost
- Nov 5
- Growing season
- 201 days
Safer after May 4 (1-in-10 risk)
Possible by Oct 24 (1-in-10 risk)
First frost typically in 4 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 15 · Apr 30 · May 15 | Oct 8 · Oct 25 · Nov 7 | 177 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 17 · May 4 | Oct 24 · Nov 5 · Nov 19 | 201 days | 100% |
| Hard freeze (28°F) | Mar 22 · Apr 5 · Apr 20 | Nov 3 · Nov 14 · Dec 2 | 224 days | 100% |
Planting calendar for Glenn
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 17 – May 23 |
| Tomatoes | Transplant outdoors | May 3 – Jul 16 |
| Peppers | Start seeds indoors | Mar 17 – Apr 17 |
| Peppers | Transplant outdoors | May 17 – Jun 17 |
| Eggplant | Start seeds indoors | Apr 3 – May 2 |
| Eggplant | Transplant outdoors | May 17 – Jun 17 |
| Cucumbers | Sow outdoors | May 17 – Jul 26 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 18 |
| Sweet corn | Sow outdoors | May 3 – Jul 16 |
| Watermelon & cantaloupe | Sow outdoors | May 17 – Jun 17 |
| Okra | Sow outdoors | May 10 – Jun 2 |
| Peas | Sow outdoors (spring) | Mar 17 – May 2 |
| Potatoes | Plant outdoors (spring) | Mar 17 – May 17 |
| Onions | Start seeds indoors (spring) | Feb 3 – Mar 2 |
| Onions | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (spring) | Feb 27 – Apr 2 |
| Broccoli | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (fall) | Jul 6 – Jul 16 |
| Broccoli | Transplant outdoors (fall) | Aug 5 – Aug 16 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 26 – Jul 26 |
| Cabbage | Transplant outdoors (fall) | Jul 26 – Aug 26 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 26 – Sep 11 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Aug 12 – Sep 16 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 26 – Sep 26 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 19 – Aug 26 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 26 – Aug 11 |
| Garlic | Plant outdoors (fall) | Oct 26 – Nov 26 |
Where these dates come from
ZIP code 49416 is matched to the NOAA station S Haven, MI, 14 km away, at 590 ft elevation (60 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| S Haven, MI (used) | 590 ft | Apr 17 | Nov 5 |
| Bloomingdale, MI | 736 ft | May 7 | Oct 11 |
| Holland Tulip City Ap, MI | 689 ft | Apr 28 | Oct 21 |
| Holland Wtp, MI | 617 ft | Apr 27 | Oct 25 |
Frost dates near Glenn
- Fennville, MI 49408 · last Apr 28, first Oct 21
- South Haven, MI 49090 · last Apr 17, first Nov 5
- Douglas, MI 49406 · last Apr 28, first Oct 21
- Pullman, MI 49450 · last May 7, first Oct 11
- Lacota, MI 49063 · last May 7, first Oct 11
- Saugatuck, MI 49453 · last Apr 28, first Oct 21
- Grand Junction, MI 49056 · last May 7, first Oct 11
- Bangor, MI 49013 · last Apr 17, first Nov 5
Frequently asked questions
- When is the last frost in Glenn, MI?
- For ZIP code 49416, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the S Haven, MI weather station. There is a 1-in-10 chance of a frost after May 4.
- When is the first frost in Glenn, MI?
- The average first fall frost (32°F) is November 5. There is a 1-in-10 chance of frost by October 24, so tender plants are at risk from that point on.
- How long is the growing season in 49416?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 201 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.