Colorado planting & frost dates
Average frost dates, USDA hardiness zones, and month-by-month planting calendars for 70 cities across Colorado. Frost here isn’t one date — the last spring frost ranges April 14–June 21 from city to city, so each page uses its own nearest NOAA station, not a statewide average.
Last spring frost
April 14 – June 21
earliest to latest, statewide
First fall frost
September 7 – October 23
earliest to latest, statewide
Hardiness zones
5b, 6a, 6b, 7a
4 sub-zones across the state
Cities in Colorado
70 cities with frost dates & calendarsC
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Planting guides by crop
156 crops- Acorn Squash
- Amaranth
- Anise
- Apple
- Apricot
- Arugula
- Asparagus
- Avocado
- Basil
- Bay Laurel
- Beet
- Bitter Melon
- Black Currant
- Blackberry
- Blueberry
- Bok Choy
- Borage
- Boysenberry
- Broccoli
- Brussels Sprouts
- Bush Bean
- Butternut Squash
- Cabbage
- Cantaloupe
- Caraway
- Cardoon
- Carrot
- Cassava
- Catnip
- Cauliflower
- Celeriac
- Celery
- Chayote
- Cherry
- Chervil
- Chives
- Cilantro
- Claytonia (Miner's Lettuce)
- Collards
- Coriander (Seed)
- Corn Salad (Mâche)
- Cowpea (Southern Pea)
- Cranberry
- Cucumber
- Delicata Squash
- Dill
- Edamame
- Eggplant
- Elderberry
- Endive
- Epazote
- Escarole
- Fennel (Bulb)
- Fenugreek
- Fig
- French Tarragon
- Gai Lan (Chinese Broccoli)
- Garlic
- Garlic Chives
- German Chamomile
- Globe Artichoke
- Goji Berry
- Gooseberry
- Gourd
- Grape
- Ground Cherry
- Hardy Kiwi
- Honeyberry (Haskap)
- Honeydew Melon
- Horseradish
- Hot Pepper
- Hyssop
- Jerusalem Artichoke (Sunchoke)
- Kale
- Kiwi
- Kohlrabi
- Lavender
- Leek
- Lemon
- Lemon Balm
- Lemongrass
- Lettuce
- Lima Bean
- Lime
- Lovage
- Luffa
- Malabar Spinach
- Marjoram
- Mint
- Mizuna
- Molokhia
- Mulberry
- Muskmelon
- Mustard Greens
- Napa Cabbage
- Nectarine
- New Zealand Spinach
- Okra
- Olive
- Onion
- Orach
- Orange
- Oregano
- Parsley
- Parsnip
- Pawpaw
- Peach
- Pear
- Peas
- Pepper
- Persimmon
- Plum
- Pole Bean
- Pomegranate
- Popcorn
- Potato
- Pumpkin
- Purslane
- Quince
- Radicchio
- Radish
- Raspberry
- Red Currant
- Rhubarb
- Rosemary
- Runner Bean
- Rutabaga
- Sage
- Salsify
- Scallion (Green Onion)
- Scorzonera
- Shallot
- Shiso (Perilla)
- Shungiku (Edible Chrysanthemum)
- Sorrel
- Spaghetti Squash
- Spinach
- Stevia
- Strawberry
- Summer Savory
- Summer Squash
- Sunflower
- Sweet Corn
- Sweet Potato
- Swiss Chard
- Tatsoi
- Thyme
- Tomatillo
- Tomato
- Turnip
- Watercress
- Watermelon
- Winter Savory
- Winter Squash
- Yardlong Bean
- Zucchini
Frost dates from 1991–2020 NOAA climate normals · hardiness zones from the USDA/PRISM map. How we compute this.