Idaho Planting Calendar
Idaho spans USDA hardiness zones 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a. 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 Idaho
Zone 5a
Winter low: -20 to -15°F
166
Growing Days
Apr 25
Last Frost
Oct 8
First Frost
9
Counties
Zone 5b
Winter low: -15 to -10°F
178
Growing Days
Apr 18
Last Frost
Oct 13
First Frost
6
Counties
Zone 6a
Winter low: -10 to -5°F
193
Growing Days
Apr 10
Last Frost
Oct 20
First Frost
8
Counties
Zone 6b
Winter low: -5 to 0°F
205
Growing Days
Apr 3
Last Frost
Oct 25
First Frost
10
Counties
Zone 7a
Winter low: 0 to 5°F
221
Growing Days
Mar 25
Last Frost
Nov 1
First Frost
10
Counties
Zone 7b
Winter low: 5 to 10°F
235
Growing Days
Mar 18
Last Frost
Nov 8
First Frost
1
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 44 Idaho counties with frost dates
| County | Zone | Last Frost | First Frost | Growing Days |
|---|---|---|---|---|
| Ada County | 7a | Apr 23 | Oct 16 | 176 |
| Adams County | 6a | May 20 | Sep 25 | 128 |
| Bannock County | 6a | May 23 | Sep 24 | 124 |
| Bear Lake County | 5a | May 24 | Sep 24 | 123 |
| Benewah County | 6b | May 8 | Oct 1 | 146 |
| Bingham County | 5b | May 21 | Sep 21 | 123 |
| Blaine County | 5b | May 18 | Oct 3 | 138 |
| Boise County | 7a | May 18 | Sep 27 | 132 |
| Bonner County | 6b | May 5 | Oct 3 | 151 |
| Bonneville County | 5b | May 26 | Sep 19 | 116 |
| Boundary County | 6a | May 10 | Sep 22 | 135 |
| Butte County | 5a | Jun 1 | Sep 14 | 105 |
| Camas County | 5a | May 3 | Oct 3 | 153 |
| Canyon County | 7a | May 4 | Oct 10 | 159 |
| Caribou County | 5a | May 30 | Sep 16 | 109 |
| Cassia County | 6b | May 15 | Oct 1 | 139 |
| Clark County | 5b | Jun 7 | Sep 10 | 95 |
| Clearwater County | 7a | May 17 | Sep 28 | 134 |
| Custer County | 5b | Jun 18 | Sep 5 | 79 |
| Elmore County | 7a | Apr 27 | Oct 14 | 170 |
| Franklin County | 6a | May 19 | Oct 3 | 137 |
| Fremont County | 5a | Jun 12 | Sep 6 | 86 |
| Gem County | 7a | May 9 | Oct 1 | 145 |
| Gooding County | 7a | May 3 | Oct 3 | 153 |
| Idaho County | 6b | May 29 | Sep 20 | 114 |
| Jefferson County | 5a | May 22 | Sep 21 | 122 |
| Jerome County | 6b | May 10 | Oct 4 | 147 |
| Kootenai County | 6b | Apr 29 | Oct 8 | 162 |
| Latah County | 6b | May 11 | Sep 23 | 135 |
| Lemhi County | 5b | Jun 9 | Sep 14 | 97 |
| Lewis County | 6b | May 20 | Sep 23 | 126 |
| Lincoln County | 6a | May 18 | Oct 3 | 138 |
| Madison County | 5a | May 31 | Sep 11 | 103 |
| Minidoka County | 6a | May 10 | Oct 3 | 146 |
| Nez Perce County | 7b | May 12 | Sep 26 | 137 |
| Oneida County | 6a | May 23 | Sep 20 | 120 |
| Owyhee County | 7a | Jun 9 | Sep 20 | 103 |
| Payette County | 7a | May 9 | Oct 1 | 145 |
| Power County | 6a | May 11 | Sep 30 | 142 |
| Shoshone County | 6b | May 10 | Sep 26 | 139 |
| Teton County | 5a | May 31 | Sep 11 | 103 |
| Twin Falls County | 6b | May 10 | Oct 4 | 147 |
| Valley County | 5a | Jun 18 | Sep 3 | 77 |
| Washington County | 7a | May 9 | Oct 1 | 145 |
🥬 Vegetables
Browse all 115 vegetables you can grow in Idaho
- 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
- 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 Idaho
- 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 39 herbs you can grow in Idaho
- Angelica
- Anise
- Basil
- Bee Balm
- Borage
- Caraway
- Catnip
- Chamomile
- Chervil
- Chives
- Cilantro
- Comfrey
- Cumin
- Dill
- Epazote
- Fennel (herb)
- Feverfew
- Garlic Chives
- Horehound
- Hyssop
- Lemon Balm
- Lemon Thyme
- Lemon Verbena
- Lemongrass
- Lovage
- Marjoram
- Mint
- Oregano
- Parsley
- Rosemary
- Rue
- Sage
- Savory
- Sorrel
- Stevia
- Tarragon
- Thai Basil
- Thyme
- Valerian
🌸 Flowers
Browse all 54 flowers you can grow in Idaho
- Ageratum
- Alliums
- Anemones
- Astilbe
- Bachelor's Button
- Begonias
- Black-eyed Susan
- Bleeding Hearts
- Calendula
- California Poppy
- Celosia
- Columbine
- Coreopsis
- Cosmos
- Crocus
- Daffodils
- Dahlias
- Daylily
- Dianthus
- Echinacea (Purple Coneflower)
- Foxglove
- Freesia
- Gaillardia (Blanket Flower)
- Geraniums
- Gladiolus
- Hostas
- Hyacinths
- Hydrangeas
- Impatiens
- Irises
- Larkspur
- Lavender
- Lilies
- Lobelia
- Lupine
- Marigolds
- Nasturtium
- Pansy
- Peonies
- Petunia
- Phlox
- Portulaca
- Ranunculus
- Roses
- Salvia
- Sedum (Stonecrop)
- Snapdragon
- Sunflower
- Sweet Alyssum
- Sweet Pea
- Tulips
- Vinca (Annual)
- Yarrow
- Zinnia
Monthly Planting Guide for Idaho
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