When to Plant Brussels Sprouts in Montana
In a typical Montana location, start seeds indoors Mar 26 – Apr 9, then transplant outdoors Apr 23 – May 7. Across the state, the outdoor planting window starts as early as Apr 14 in Laurel and as late as May 23 in Butte.
Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.
Brussels Sprouts Planting Dates by City
| City | Start indoors | Transplant |
|---|---|---|
| Billings | Mar 22 – Apr 5 | Apr 19 – May 3 |
| Missoula | Mar 22 – Apr 5 | Apr 19 – May 3 |
| Great Falls | Mar 18 – Apr 1 | Apr 15 – Apr 29 |
| Bozeman | Apr 7 – Apr 21 | May 5 – May 19 |
| Butte | Apr 25 – May 9 | May 23 – Jun 6 |
| Helena | Mar 21 – Apr 4 | Apr 18 – May 2 |
| Kalispell | Apr 12 – Apr 26 | May 10 – May 24 |
| Havre | Mar 27 – Apr 10 | Apr 24 – May 8 |
| Anaconda | Apr 13 – Apr 27 | May 11 – May 25 |
| Miles City | Mar 20 – Apr 3 | Apr 17 – May 1 |
| Helena Valley Southeast | Mar 21 – Apr 4 | Apr 18 – May 2 |
| Belgrade | Apr 7 – Apr 21 | May 5 – May 19 |
| Helena Valley West Central | Mar 21 – Apr 4 | Apr 18 – May 2 |
| Evergreen | Apr 12 – Apr 26 | May 10 – May 24 |
| Livingston | Apr 8 – Apr 22 | May 6 – May 20 |
| Whitefish | Mar 28 – Apr 11 | Apr 25 – May 9 |
| Laurel | Mar 17 – Mar 31 | Apr 14 – Apr 28 |
| Sidney | Mar 23 – Apr 6 | Apr 20 – May 4 |
| Lockwood | Mar 22 – Apr 5 | Apr 19 – May 3 |
| Lewistown | Mar 26 – Apr 9 | Apr 23 – May 7 |
Showing the 20 most populous of 20 Montana cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Montana cities.
Frequently Asked Questions
When should I plant Brussels sprouts in Montana?
In a typical Montana location, start seeds indoors Mar 26 – Apr 9, then transplant outdoors Apr 23 – May 7. Across the state, the outdoor planting window starts as early as Apr 14 in Laurel and as late as May 23 in Butte.
When is the last frost in Montana?
The average last spring frost in Montana ranges from May 5 in Laurel to June 13 in Butte, based on NOAA 1991–2020 climate normals.
How long do Brussels sprouts take to grow?
Brussels Sprouts typically take 90–110 days from planting to harvest. Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.
Other Crops in Montana
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Corn
- Green Beans
- Peas
- Lettuce
- Spinach
- Kale
- Arugula
- Swiss Chard
- Broccoli
- Cauliflower
- Cabbage
- Carrots
- Beets
- Radishes
- Turnips
- Onions
- Garlic
- Potatoes
- Sweet Potatoes
- Asparagus
- Basil
- Cilantro
- Parsley
- Dill
- Oregano
- Thyme
- Sunflowers
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
- Dahlias
When to plant Brussels sprouts in other states