Last spring frost
Apr 28
Frost Dates for Fennville, MI
First fall frost
Oct 21
Growing season
175 days
Hardiness zone
6b
In an average year around Fennville, MI, the last spring frost (32°F) is about Apr 28 and the first fall frost is about Oct 21, giving roughly a 175-day growing season. To be safe most years, wait until Apr 13 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 26 | May 8 | Apr 25 |
| Freeze (32°F) | May 16 | Apr 28 | Apr 13 |
| Hard (28°F) | May 3 | Apr 16 | Apr 2 |
| Severe (24°F) | Apr 17 | Apr 3 | Mar 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 21 | May 17 | May 12 | May 8 | May 5 | May 2 | Apr 29 | Apr 25 |
| 32°F | May 16 | May 9 | May 4 | May 1 | Apr 28 | Apr 25 | Apr 22 | Apr 19 | Apr 13 |
| 28°F | May 3 | Apr 27 | Apr 22 | Apr 19 | Apr 16 | Apr 12 | Apr 9 | Apr 6 | Apr 2 |
| 24°F | Apr 17 | Apr 11 | Apr 8 | Apr 5 | Apr 3 | Apr 1 | Mar 29 | Mar 25 | Mar 19 |
| 20°F | Apr 4 | Apr 1 | Mar 29 | Mar 25 | Mar 22 | Mar 19 | Mar 16 | Mar 12 | Mar 7 |
| 16°F | Mar 27 | Mar 22 | Mar 18 | Mar 15 | Mar 12 | Mar 9 | Mar 5 | Mar 1 | Feb 24 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 21 | Oct 6 | Oct 20 |
| Freeze (32°F) | Oct 4 | Oct 21 | Nov 4 |
| Hard (28°F) | Oct 21 | Nov 3 | Nov 19 |
| Severe (24°F) | Nov 2 | Nov 16 | Dec 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 21 | Sep 26 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 12 | Oct 16 | Oct 20 |
| 32°F | Oct 4 | Oct 10 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 4 |
| 28°F | Oct 21 | Oct 26 | Oct 30 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 19 |
| 24°F | Nov 2 | Nov 6 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 4 |
| 20°F | Nov 10 | Nov 17 | Nov 22 | Nov 27 | Nov 30 | Dec 3 | Dec 7 | Dec 13 | Dec 20 |
| 16°F | Nov 22 | Nov 30 | Dec 4 | Dec 8 | Dec 14 | Dec 19 | Dec 23 | Dec 27 | Jan 2 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Holland Tulip City Ap, Mi, about 12.1 miles away@if(!empty($station['elevation_ft'])), at 689 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Fennville, MI?
On average, the last spring frost (32°F) around Fennville, MI is about Apr 28. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 13.
When is the first frost in the fall?
The first fall frost around Fennville, MI typically arrives about Oct 21. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 28 on average, or Apr 13 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 175 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 49408 Planting calendar → Michigan frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026