Frost dates for Brady (The Knees), MT
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 13
typical year
Safe to plant
May 29
frost is over in 9 of 10 years
First fall frost
September 29
typical year
Growing season
137 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 15 – 29 | – |
| Spinach | – | Apr 1 – 22 | Aug 4 – 18 |
| Lettuce | – | Apr 15 – May 6 | Aug 4 – 18 |
| Radishes | – | Apr 15 – May 27 | Aug 18 – Sep 1 |
| Onions | – | Apr 15 – 29 | – |
| Potatoes | – | Apr 22 – May 6 | – |
| Carrots | – | Apr 22 – May 13 | Jul 7 – 21 |
| Beets | – | Apr 15 – 29 | Jul 21 – Aug 4 |
| Kale | Mar 4 – 18 | Apr 15 – 29 | Jul 21 – Aug 4 |
| Broccoli | Mar 4 – 18 | Apr 29 – May 13 | Jul 21 – Aug 4 |
| Cabbage | Feb 18 – Mar 4 | Apr 15 – 29 | Jul 21 – Aug 4 |
| Garlic | – | – | Aug 18 – Sep 8 |
| Warm-season crops | |||
| Tomatoes | Apr 3 – 17 | May 29 – Jun 12 | – |
| Peppers | Mar 27 – Apr 10 | Jun 5 – 19 | – |
| Cucumbers | – | May 29 – Jun 19 | – |
| Zucchini | – | May 29 – Jun 26 | – |
| Pumpkins | – | May 29 – Jun 19 | – |
| Green beans | – | May 29 – Jul 21 | – |
| Sweet corn | – | May 29 – Jun 26 | – |
| Basil | Apr 24 – May 8 | Jun 5 – 12 | – |
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 29 | May 13 | April 30 |
| Fall frost before | September 16 | September 29 | October 11 |
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 May 2 (May 13 in a late year), and the first one in fall around October 6.
Where these dates come from
NOAA weather station BRADY 27 ENE (THE KNEES), MT US (USC00241081), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 13 miles:
59416
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.