Frost dates for Granite Falls, 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 4
typical year
Safe to plant
May 18
frost is over in 9 of 10 years
First fall frost
October 1
typical year
Growing season
150 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 6 – 20 | – |
| Spinach | – | Mar 23 – Apr 13 | Aug 6 – 20 |
| Lettuce | – | Apr 6 – 27 | Aug 6 – 20 |
| Radishes | – | Apr 6 – May 18 | Aug 20 – Sep 3 |
| Onions | – | Apr 6 – 20 | – |
| Potatoes | – | Apr 13 – 27 | – |
| Carrots | – | Apr 13 – May 4 | Jul 9 – 23 |
| Beets | – | Apr 6 – 20 | Jul 23 – Aug 6 |
| Kale | Feb 23 – Mar 9 | Apr 6 – 20 | Jul 23 – Aug 6 |
| Broccoli | Feb 23 – Mar 9 | Apr 20 – May 4 | Jul 23 – Aug 6 |
| Cabbage | Feb 9 – 23 | Apr 6 – 20 | Jul 23 – Aug 6 |
| Garlic | – | – | Aug 20 – Sep 10 |
| Warm-season crops | |||
| Tomatoes | Mar 23 – Apr 6 | May 18 – Jun 1 | – |
| Peppers | Mar 16 – 30 | May 25 – Jun 8 | – |
| Cucumbers | – | May 18 – Jun 8 | – |
| Zucchini | – | May 18 – Jun 15 | – |
| Pumpkins | – | May 18 – Jun 8 | – |
| Green beans | – | May 18 – Jul 23 | – |
| Sweet corn | – | May 18 – Jun 15 | – |
| Basil | Apr 13 – 27 | May 25 – Jun 1 | – |
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 18 | May 4 | April 21 |
| Fall frost before | September 17 | October 1 | October 15 |
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 25 (May 9 in a late year), and the first one in fall around October 11.
Towns that use these dates
This is the nearest NOAA station with frost records for 8 towns.
Granite Falls, Clara City, Sacred Heart, Wood Lake, Maynard, Hanley Falls, Echo, Hazel Run
Where these dates come from
NOAA weather station GRANITE FALLS, MN US (USC00213311), 1991–2020 climate normals. It's the nearest station for 7 zip codes, all within 15 miles:
56222, 56237, 56241, 56245, 56260, 56285, 56297
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.