Flagstaff, Arizona planting calendar and frost dates

Frost dates in Flagstaff

NOAA U.S. Climate Normals 1991-2020 for Flagstaff Pulliam Airport, 3.8 miles SSW of the city center and 103 feet higher. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.

What to plant each month in Flagstaff

1. February

   Start indoors: onions

2. March

   Start indoors: broccoli, cabbages, cauliflower, collard greens, kale, leeks, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, snapdragons

3. April

   Start indoors: basil, black-eyed susans, broccoli, cabbages, cauliflower, celery, chives, cilantro, collard greens, eggplants, ginger, kale, leeks, lettuce, marigolds, nasturtiums, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons, spinach, swiss chard, tomatoes

   Plant or sow outdoors: black-eyed susans, blueberries, garlic, grapes, grass seed, hollyhocks, kale, onions, peas, poppies, raspberries, rhubarb, strawberries, turnips, wildflowers

4. May

   Start indoors: basil, cantaloupes, cilantro, cosmos, cucumbers, marigolds, nasturtiums, okra, pumpkins, ranunculus, tomatoes, watermelons, winter squash, zinnias, zucchini

   Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garlic, gladioli, grapes, grass seed, green onions, hollyhocks, kale, kentucky bluegrass, leeks, lettuce, onions, parsley, peas, perennial ryegrass, poppies, potatoes, radishes, ranunculus, raspberries, rhubarb, roses, snapdragons, spinach, strawberries, sweet peas, swiss chard, tall fescue, turnips, wildflowers

5. June

   Start indoors: cosmos, okra, pumpkins, winter squash

   Plant or sow outdoors: asparagus, basil, beets, cantaloupes, carrots, chives, cilantro, cucumbers, dahlias, dill, eggplants, figs, garden mums, ginger, gladioli, grapes, green beans, green onions, kentucky bluegrass, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, oregano, parsley, peppers, perennial ryegrass, petunias, pumpkins, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet peas, swiss chard, tall fescue, thyme, tomatoes, watermelons, winter squash, zinnias, zucchini

   Plant for fall: brussels sprouts, collard greens, lettuce, swiss chard

6. July

   Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, garden mums, green onions, okra, peanuts, pumpkins, st. augustinegrass, sweet potatoes, winter squash, zoysiagrass

   Plant for fall: bearded irises, beets, broccoli, cabbages, carrots, cauliflower, collard greens, daylilies, kale, lettuce, peas, radishes, snapdragons, spinach, swiss chard, turnips

7. August

   Plant or sow outdoors: bermudagrass, centipedegrass, st. augustinegrass, zoysiagrass

   Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, hydrangeas, kale, lettuce, lilies, ornamental alliums, peonies, radishes, roses, saffron, snapdragons, spinach, tulips, turnips

8. September

   Plant for fall: crocuses, daffodils, daylilies, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips

9. October

   Plant for fall: crocuses, garlic, hyacinths, ornamental alliums, tulips

Frost dates and zones by ZIP code in Flagstaff

All 3 of Flagstaff's main ZIP codes take their frost dates from Flagstaff Pulliam Airport, so the dates on this page apply across the city. The hardiness zone is 6a in 86001, 86005, and 6b in 86004.

Planting dates for popular crops in Flagstaff

Nearby cities

• Prescott Valley, AZ zone 7b, last frost Apr 20
• Peoria, AZ zone 9b, last frost Jan 20
• Scottsdale, AZ zone 9b
• Phoenix, AZ zone 9b
• Surprise, AZ zone 9b, last frost Jan 20
• Glendale, AZ zone 9b, last frost Jan 20