Colorado Planting Calendar
Colorado spans USDA hardiness zones 3a, 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 Colorado
Zone 3b
Winter low: -35 to -30°F
135
Growing Days
May 10
Last Frost
Sep 22
First Frost
1
Counties
Zone 4a
Winter low: -30 to -25°F
145
Growing Days
May 6
Last Frost
Sep 28
First Frost
9
Counties
Zone 4b
Winter low: -25 to -20°F
155
Growing Days
May 1
Last Frost
Oct 3
First Frost
8
Counties
Zone 5a
Winter low: -20 to -15°F
166
Growing Days
Apr 25
Last Frost
Oct 8
First Frost
19
Counties
Zone 5b
Winter low: -15 to -10°F
178
Growing Days
Apr 18
Last Frost
Oct 13
First Frost
17
Counties
Zone 6a
Winter low: -10 to -5°F
193
Growing Days
Apr 10
Last Frost
Oct 20
First Frost
9
Counties
Zone 6b
Winter low: -5 to 0°F
205
Growing Days
Apr 3
Last Frost
Oct 25
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 64 Colorado counties with frost dates
| County | Zone | Last Frost | First Frost | Growing Days |
|---|---|---|---|---|
| Adams County | 5b | May 4 | Oct 5 | 154 |
| Alamosa County | 4b | May 31 | Sep 19 | 111 |
| Arapahoe County | 5b | May 10 | Oct 7 | 150 |
| Archuleta County | 5b | Jun 13 | Sep 17 | 96 |
| Baca County | 6a | Apr 19 | Oct 18 | 182 |
| Bent County | 6a | Apr 29 | Oct 9 | 163 |
| Boulder County | 5b | May 14 | Sep 26 | 135 |
| Broomfield County | 5b | May 14 | Sep 26 | 135 |
| Chaffee County | 5a | Jun 16 | Sep 7 | 83 |
| Cheyenne County | 5b | May 2 | Oct 11 | 162 |
| Clear Creek County | 4b | May 14 | Sep 26 | 135 |
| Conejos County | 4b | Jun 9 | Sep 17 | 100 |
| Costilla County | 5a | Jun 8 | Sep 16 | 100 |
| Crowley County | 6a | Apr 26 | Oct 9 | 166 |
| Custer County | 5a | May 23 | Sep 25 | 125 |
| Delta County | 6a | May 1 | Oct 8 | 160 |
| Denver County | 5b | May 14 | Sep 26 | 135 |
| Dolores County | 5a | Jun 18 | Sep 8 | 82 |
| Douglas County | 5b | May 22 | Sep 20 | 121 |
| Eagle County | 4b | Jun 16 | Sep 7 | 83 |
| El Paso County | 5b | May 11 | Oct 6 | 148 |
| Elbert County | 5a | May 12 | Oct 3 | 144 |
| Fremont County | 5b | May 23 | Sep 25 | 125 |
| Garfield County | 5b | May 25 | Sep 21 | 119 |
| Gilpin County | 4b | May 14 | Sep 26 | 135 |
| Grand County | 4a | May 28 | Sep 19 | 114 |
| Gunnison County | 4a | Jun 12 | Sep 10 | 90 |
| Hinsdale County | 4a | Jun 18 | Sep 10 | 84 |
| Huerfano County | 5b | May 12 | Sep 30 | 141 |
| Jackson County | 3b | Jun 13 | Sep 4 | 83 |
| Jefferson County | 5b | May 14 | Sep 26 | 135 |
| Kiowa County | 5b | Apr 29 | Oct 9 | 163 |
| Kit Carson County | 5a | May 9 | Oct 8 | 152 |
| La Plata County | 5b | May 31 | Sep 21 | 113 |
| Lake County | 4a | Jun 21 | Aug 30 | 70 |
| Larimer County | 5a | May 2 | Oct 6 | 157 |
| Las Animas County | 6a | May 10 | Oct 4 | 147 |
| Lincoln County | 5b | May 13 | Oct 3 | 143 |
| Logan County | 5a | May 11 | Oct 5 | 147 |
| Mesa County | 6b | May 1 | Oct 9 | 161 |
| Mineral County | 4a | Jun 10 | Sep 13 | 95 |
| Moffat County | 5a | Jun 7 | Sep 14 | 99 |
| Montezuma County | 5b | May 27 | Sep 27 | 123 |
| Montrose County | 6a | Jun 13 | Sep 12 | 91 |
| Morgan County | 5a | May 10 | Oct 5 | 148 |
| Otero County | 6a | Apr 26 | Oct 9 | 166 |
| Ouray County | 5a | Jun 18 | Sep 10 | 84 |
| Park County | 4b | Jun 16 | Sep 4 | 80 |
| Phillips County | 5a | May 4 | Oct 7 | 156 |
| Pitkin County | 4a | Jun 16 | Sep 7 | 83 |
| Prowers County | 6a | Apr 30 | Oct 10 | 163 |
| Pueblo County | 6a | May 7 | Oct 7 | 153 |
| Rio Blanco County | 5a | Jun 2 | Sep 17 | 107 |
| Rio Grande County | 4b | May 31 | Sep 19 | 111 |
| Routt County | 4a | Jun 12 | Sep 8 | 88 |
| Saguache County | 4b | May 30 | Sep 20 | 113 |
| San Juan County | 4a | Jun 18 | Sep 8 | 82 |
| San Miguel County | 5a | May 31 | Sep 21 | 113 |
| Sedgwick County | 5a | May 4 | Oct 8 | 157 |
| Summit County | 4a | Jun 16 | Sep 4 | 80 |
| Teller County | 5a | May 11 | Oct 6 | 148 |
| Washington County | 5a | May 10 | Oct 5 | 148 |
| Weld County | 5a | May 2 | Oct 7 | 158 |
| Yuma County | 5a | May 11 | Oct 5 | 147 |
🥬 Vegetables
Browse all 116 vegetables you can grow in Colorado
- 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 Colorado
- 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 Colorado
- 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
Monthly Planting Guide for Colorado
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