Frost dates for Hartford, MI
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
April 22
typical year
Safe to plant
May 7
frost is over in 9 of 10 years
First fall frost
October 30
typical year
Growing season
189 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 25 – Apr 8 | – |
| Spinach | – | Mar 11 – Apr 1 | Sep 4 – 18 |
| Lettuce | – | Mar 25 – Apr 15 | Sep 4 – 18 |
| Radishes | – | Mar 25 – May 6 | Sep 18 – Oct 2 |
| Onions | – | Mar 25 – Apr 8 | – |
| Potatoes | – | Apr 1 – 15 | – |
| Carrots | – | Apr 1 – 22 | Aug 7 – 21 |
| Beets | – | Mar 25 – Apr 8 | Aug 21 – Sep 4 |
| Kale | Feb 11 – 25 | Mar 25 – Apr 8 | Aug 21 – Sep 4 |
| Broccoli | Feb 11 – 25 | Apr 8 – 22 | Aug 21 – Sep 4 |
| Cabbage | Jan 28 – Feb 11 | Mar 25 – Apr 8 | Aug 21 – Sep 4 |
| Garlic | – | – | Sep 18 – Oct 9 |
| Warm-season crops | |||
| Tomatoes | Mar 12 – 26 | May 7 – 21 | – |
| Peppers | Mar 5 – 19 | May 14 – 28 | – |
| Cucumbers | – | May 7 – 28 | – |
| Zucchini | – | May 7 – Jun 4 | – |
| Pumpkins | – | May 7 – 28 | – |
| Green beans | – | May 7 – Aug 21 | – |
| Sweet corn | – | May 7 – Jun 4 | – |
| Basil | Apr 2 – 16 | May 14 – 21 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | May 7 | April 22 | April 6 |
| Fall frost before | October 15 | October 30 | November 12 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around April 9 (April 24 in a late year), and the first one in fall around November 9.
Towns that use these dates
This is the nearest NOAA station with frost records for 3 towns.
Hartford, Berrien Springs, Eau Claire
Where these dates come from
NOAA weather station EAU CLAIRE 4 NE, MI US (USC00202445), 1991–2020 climate normals. It's the nearest station for 6 zip codes, all within 12 miles:
49057, 49102, 49103, 49104, 49111, 49126
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.