Frost dates for 48851Lyons, MI
The average last spring frost in Lyons is May 3 and the average first fall frost is October 12, giving a typical growing season of about 161 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 3
- Average first fall frost
- Oct 12
- Growing season
- 161 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 29 (1-in-10 risk)
Last frost typically in 181 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 30 · May 16 · Jun 1 | Sep 18 · Oct 1 · Oct 15 | 139 days | 100% |
| Frost / freeze (32°F) | Apr 17 · May 3 · May 21 | Sep 29 · Oct 12 · Oct 27 | 161 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 9 | Oct 7 · Oct 27 · Nov 10 | 186 days | 100% |
Planting calendar for Lyons
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 22 |
| 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 2 |
| Summer squash | Sow outdoors | May 19 – Jul 3 |
| Winter squash & pumpkins | Sow outdoors | Jun 2 – Jul 3 |
| Snap beans | Sow outdoors | May 19 – Jul 25 |
| Sweet corn | Sow outdoors | May 19 – Jun 22 |
| 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 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 5 – Apr 2 |
| Cabbage | Transplant outdoors (spring) | Apr 2 – May 3 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Apr 2 – Jun 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 26 – May 9 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Apr 2 – May 23 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 19 – May 9 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | May 3 – Jun 18 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 48851 is matched to the NOAA station Ionia 2Ssw, MI, 12.8 km away, at 805 ft elevation (80 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ionia 2Ssw, MI (used) | 805 ft | May 3 | Oct 12 |
| Saint Johns, MI | 743 ft | Apr 28 | Oct 24 |
| Lansing Capital City Ap, MI | 841 ft | May 1 | Oct 13 |
| Greenville 2 Nne, MI | 882 ft | May 18 | Sep 28 |
Frost dates near Lyons
- Pewamo, MI 48873 · last May 3, first Oct 12
- Muir, MI 48860 · last May 3, first Oct 12
- Westphalia, MI 48894 · last Apr 28, first Oct 24
- Portland, MI 48875 · last May 3, first Oct 12
- Ionia, MI 48846 · last May 3, first Oct 12
- Fowler, MI 48835 · last Apr 28, first Oct 24
- Hubbardston, MI 48845 · last Apr 28, first Oct 24
- Palo, MI 48870 · last May 3, first Oct 12
Frequently asked questions
- When is the last frost in Lyons, MI?
- For ZIP code 48851, the average last spring frost (32°F) is May 3, based on NOAA 1991-2020 climate normals for the Ionia 2Ssw, MI weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Lyons, MI?
- The average first fall frost (32°F) is October 12. There is a 1-in-10 chance of frost by September 29, so tender plants are at risk from that point on.
- How long is the growing season in 48851?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 161 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.