Montana Planting Calendar
Montana spans USDA hardiness zones 3a, 3b, 4a, 4b, 5a, 5b. Planting dates vary significantly across the state depending on your zone. Find your county on the map below for exact frost dates and planting windows.
Find Your County
Click any county to see your local planting calendar with exact frost dates and planting windows.
Hover over a county to see details. Click to view planting guide.
Zones in Montana
Zone 3b
Winter low: -35 to -30°F
135
Growing Days
May 10
Last Frost
Sep 22
First Frost
3
Counties
Zone 4a
Winter low: -30 to -25°F
145
Growing Days
May 6
Last Frost
Sep 28
First Frost
13
Counties
Zone 4b
Winter low: -25 to -20°F
155
Growing Days
May 1
Last Frost
Oct 3
First Frost
19
Counties
Zone 5a
Winter low: -20 to -15°F
166
Growing Days
Apr 25
Last Frost
Oct 8
First Frost
16
Counties
Zone 5b
Winter low: -15 to -10°F
178
Growing Days
Apr 18
Last Frost
Oct 13
First Frost
2
Counties
Zone 6a
Winter low: -10 to -5°F
193
Growing Days
Apr 10
Last Frost
Oct 20
First Frost
3
Counties
Growing Season Comparison
Growing Season by Zone
Zone 1a
Jun 15 – Aug 15
Zone 1b
Jun 7 – Aug 25
Zone 2a
May 30 – Sep 1
Zone 2b
May 22 – Sep 10
Zone 3a
May 15 – Sep 15
Zone 4a
May 6 – Sep 28
Zone 5a
Apr 25 – Oct 8
Zone 5b
Apr 18 – Oct 13
Zone 6a
Apr 10 – Oct 20
Zone 6b
Apr 3 – Oct 25
Zone 7a
Mar 25 – Nov 1
Zone 7b
Mar 18 – Nov 8
Zone 8a
Mar 8 – Nov 18
Zone 8b
Feb 25 – Nov 28
Zone 9a
Feb 10 – Dec 10
Zone 10a
Jan 1 – Dec 31
0
90
180
270
365 days
Frost Dates & Growing Season by County
View all 56 Montana counties with frost dates
| County | Zone | Last Frost | First Frost | Growing Days |
|---|---|---|---|---|
| Beaverhead County | 5a | Jun 10 | Sep 12 | 94 |
| Big Horn County | 5a | May 13 | Sep 30 | 140 |
| Blaine County | 4a | May 14 | Sep 24 | 133 |
| Broadwater County | 5a | May 20 | Sep 20 | 123 |
| Carbon County | 5a | May 13 | Sep 28 | 138 |
| Carter County | 4b | May 15 | Sep 22 | 130 |
| Cascade County | 4b | May 19 | Sep 21 | 125 |
| Chouteau County | 4a | May 12 | Sep 27 | 138 |
| Custer County | 4b | May 14 | Sep 27 | 136 |
| Daniels County | 3b | May 20 | Sep 16 | 119 |
| Dawson County | 4a | May 14 | Sep 22 | 131 |
| Deer Lodge County | 5a | Jun 15 | Sep 7 | 84 |
| Fallon County | 4b | May 20 | Sep 20 | 123 |
| Fergus County | 4b | May 20 | Sep 20 | 123 |
| Flathead County | 5a | Jun 3 | Sep 10 | 99 |
| Gallatin County | 5a | Jun 8 | Sep 19 | 103 |
| Garfield County | 4b | May 16 | Sep 21 | 128 |
| Glacier County | 4b | May 22 | Sep 18 | 119 |
| Golden Valley County | 4b | May 22 | Sep 20 | 121 |
| Granite County | 5a | May 29 | Sep 20 | 114 |
| Hill County | 4a | May 14 | Sep 23 | 132 |
| Jefferson County | 5a | Jun 15 | Sep 7 | 84 |
| Judith Basin County | 4b | May 23 | Sep 19 | 119 |
| Lake County | 6a | May 31 | Sep 12 | 104 |
| Lewis and Clark County | 4b | May 29 | Sep 18 | 112 |
| Liberty County | 4a | May 26 | Sep 15 | 112 |
| Lincoln County | 5a | May 16 | Sep 23 | 130 |
| Madison County | 5a | Jun 11 | Sep 13 | 94 |
| McCone County | 4a | May 14 | Sep 22 | 131 |
| Meagher County | 4b | Jun 10 | Sep 8 | 90 |
| Mineral County | 6a | May 30 | Sep 20 | 113 |
| Missoula County | 5b | May 14 | Sep 23 | 132 |
| Musselshell County | 4b | May 14 | Sep 23 | 132 |
| Park County | 5a | May 24 | Sep 20 | 119 |
| Petroleum County | 4b | May 18 | Sep 24 | 129 |
| Phillips County | 3b | May 18 | Sep 21 | 126 |
| Pondera County | 4a | May 23 | Sep 16 | 116 |
| Powder River County | 4b | May 15 | Sep 22 | 130 |
| Powell County | 4b | Jun 6 | Sep 8 | 94 |
| Prairie County | 4a | May 11 | Oct 1 | 143 |
| Ravalli County | 5b | May 21 | Sep 20 | 122 |
| Richland County | 4a | May 14 | Sep 20 | 129 |
| Roosevelt County | 4a | May 17 | Sep 18 | 124 |
| Rosebud County | 4b | May 11 | Oct 3 | 145 |
| Sanders County | 6a | May 24 | Sep 13 | 112 |
| Sheridan County | 3b | May 17 | Sep 18 | 124 |
| Silver Bow County | 5a | Jun 15 | Sep 7 | 84 |
| Stillwater County | 5a | May 22 | Sep 22 | 123 |
| Sweet Grass County | 5a | May 22 | Sep 19 | 120 |
| Teton County | 4b | May 25 | Sep 16 | 114 |
| Toole County | 4a | May 24 | Sep 17 | 116 |
| Treasure County | 4b | May 11 | Oct 1 | 143 |
| Valley County | 4a | May 13 | Sep 21 | 131 |
| Wheatland County | 4b | May 19 | Sep 21 | 125 |
| Wibaux County | 4a | May 14 | Sep 22 | 131 |
| Yellowstone County | 5a | May 9 | Oct 3 | 147 |
🥬 Vegetables
Browse all 116 vegetables you can grow in Montana
- Acorn Squash
- Amaranth
- Artichoke
- Arugula
- Asparagus
- Beets
- Belgian Endive
- Bitter Melon
- Black Beans
- Bok Choy
- Broccoli
- Broccoli Rabe
- Brussels Sprouts
- Butternut Squash
- Cabbage
- Calabash
- Cardoon
- Carrots
- Cauliflower
- Celeriac
- Celery
- Celtuce
- Chard
- Chayote
- Chickpeas
- Chicory
- Chinese Cabbage
- Christmas Lima Beans
- Collard Greens
- Corn
- Cowpeas
- Cress
- Crookneck Squash
- Crosne
- Cucumber
- Daikon
- Delicata Squash
- Edamame
- Eggplant
- Endive
- Escarole
- Fava Beans
- Fennel
- Garlic
- Ginger
- Green Beans
- Horseradish
- Hot Peppers
- Hubbard Squash
- Jicama
- Kabocha
- Kai Lan
- Kale
- Kidney Beans
- Kohlrabi
- Komatsuna
- Leeks
- Lentils
- Lettuce
- Lima Beans
- Loofah
- Luffa
- Mache
- Malabar Spinach
- Melon
- Microgreens
- Mitsuba
- Mizuna
- Mustard Greens
- Napa Cabbage
- New Zealand Spinach
- Okra
- Onion
- Pac Choi
- Parsnip
- Patty Pan Squash
- Peas
- Peppers
- Pole Beans
- Potatoes
- Pumpkin
- Purslane
- Radicchio
- Radish
- Rhubarb
- Romanesco
- Rutabaga
- Salsify
- Savoy Cabbage
- Scallions
- Scarlet Runner Beans
- Shallot
- Shiso
- Snap Peas
- Snow Peas
- Soybeans
- Spaghetti Squash
- Spinach
- Squash (Summer)
- Squash (Winter)
- Sunchoke
- Sunflower
- Sweet Corn
- Sweet Potatoes
- Tatsoi
- Tomatillo
- Tomatoes
- Turmeric
- Turnip
- Watercress
- Watermelon
- Wax Beans
- Winter Melon
- Yam
- Yard Long Beans
- Zucchini
🍓 Fruits
Browse all 34 fruits you can grow in Montana
- Alpine Strawberries
- Aronia
- Blackberries
- Blueberries
- Boysenberries
- Cantaloupe
- Che Fruit
- Cranberries
- Currants
- Dragon Fruit
- Elderberries
- Figs
- Goji Berries
- Gooseberries
- Grapes
- Ground Cherry
- Guava
- Hardy Kiwi
- Haskaps
- Honeydew
- Jostaberry
- Kiwi
- Lingonberries
- Loquat
- Medlar
- Mulberries
- Passion Fruit
- Pawpaw
- Persimmon
- Pomegranate
- Quince
- Raspberries
- Serviceberries
- Strawberries
🌿 Herbs
Browse all 42 herbs you can grow in Montana
- Angelica
- Anise
- Basil
- Bee Balm
- Borage
- Caraway
- Catnip
- Chamomile
- Chervil
- Chives
- Cilantro
- Comfrey
- Cumin
- Dill
- Echinacea
- Epazote
- Fennel (herb)
- Feverfew
- Garlic Chives
- Horehound
- Hyssop
- Lavender
- Lemon Balm
- Lemon Thyme
- Lemon Verbena
- Lemongrass
- Lovage
- Marjoram
- Mint
- Oregano
- Parsley
- Rosemary
- Rue
- Sage
- Savory
- Sorrel
- Stevia
- Tarragon
- Thai Basil
- Thyme
- Valerian
- Yarrow
🌸 Flowers
Browse all 1 flowers you can grow in Montana
Monthly Planting Guide for Montana
The Gardener's Encyclopedia to Companion Planting
$27
$293 value
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners