Frost dates for St. Peter, MN
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
May 2
typical year
Safe to plant
May 14
frost is over in 9 of 10 years
First fall frost
October 4
typical year
Growing season
153 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 | – | Apr 4 – 18 | – |
| Spinach | – | Mar 21 – Apr 11 | Aug 9 – 23 |
| Lettuce | – | Apr 4 – 25 | Aug 9 – 23 |
| Radishes | – | Apr 4 – May 16 | Aug 23 – Sep 6 |
| Onions | – | Apr 4 – 18 | – |
| Potatoes | – | Apr 11 – 25 | – |
| Carrots | – | Apr 11 – May 2 | Jul 12 – 26 |
| Beets | – | Apr 4 – 18 | Jul 26 – Aug 9 |
| Kale | Feb 21 – Mar 7 | Apr 4 – 18 | Jul 26 – Aug 9 |
| Broccoli | Feb 21 – Mar 7 | Apr 18 – May 2 | Jul 26 – Aug 9 |
| Cabbage | Feb 7 – 21 | Apr 4 – 18 | Jul 26 – Aug 9 |
| Garlic | – | – | Aug 23 – Sep 13 |
| Warm-season crops | |||
| Tomatoes | Mar 19 – Apr 2 | May 14 – 28 | – |
| Peppers | Mar 12 – 26 | May 21 – Jun 4 | – |
| Cucumbers | – | May 14 – Jun 4 | – |
| Zucchini | – | May 14 – Jun 11 | – |
| Pumpkins | – | May 14 – Jun 4 | – |
| Green beans | – | May 14 – Jul 26 | – |
| Sweet corn | – | May 14 – Jun 11 | – |
| Basil | Apr 9 – 23 | May 21 – 28 | – |
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 14 | May 2 | April 19 |
| Fall frost before | September 21 | October 4 | October 16 |
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 22 (May 5 in a late year), and the first one in fall around October 13.
Towns that use these dates
This is the nearest NOAA station with frost records for 7 towns.
St. Peter, Le Sueur, Le Center, Madison Lake, Henderson, Cleveland, Kasota
Where these dates come from
NOAA weather station ST PETER, MN US (USC00217405), 1991–2020 climate normals. It's the nearest station for 7 zip codes, all within 14 miles:
56017, 56028, 56050, 56057, 56058, 56063, 56082
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.