Casa Grande, Arizona planting calendar and frost dates
Casa Grande is in USDA hardiness zone 9a. The last spring frost typically comes around February 5 and the first fall frost around December 6, giving about 305 frost-free days a year.
- Hardiness zone
- Zone 9a
- Typical last frost
- February 5
- Typical first frost
- December 6
- Frost-free season
- 305 days
Frost dates in Casa Grande
Last spring frost
- January 5Risky: frost later than this in 9 years out of 10
- February 5Typical: a later frost in half of years
- February 28Safe: a later frost only 1 year in 10
First fall frost
- November 18Risky: frost earlier than this 1 year in 10
- December 6Typical: an earlier frost in half of years
- December 29Late: frost before this in 9 years out of 10
The growing season between the typical last and first frosts is about 305 days. Frost here means a low of 32°F at the weather station. A hard freeze (28°F), which damages most hardy crops too, typically ends around January 14 and returns around December 22.
NOAA U.S. Climate Normals 1991-2020 for Casa Grande, 2.8 miles SE of the city center. 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 Casa Grande
January
Start indoors: basil, cantaloupes, celery, cilantro, eggplants, marigolds, nasturtiums, peppers, ranunculus, spinach, swiss chard, tomatoes, watermelons
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, poppies, potatoes, radishes, ranunculus, raspberries, rhubarb, roses, snapdragons, spinach, strawberries, sweet peas, swiss chard, tall fescue, turnips, wildflowers
February
Start indoors: cantaloupes, cosmos, cucumbers, okra, pumpkins, watermelons, winter squash, zucchini
Plant or sow outdoors: asparagus, avocados, beets, carrots, chives, cilantro, dahlias, dill, figs, garden mums, ginger, gladioli, grapes, green onions, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, oregano, parsley, petunias, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, swiss chard, thyme
March
Start indoors: zinnias
Plant or sow outdoors: avocados, basil, bermudagrass, cantaloupes, celery, centipedegrass, cosmos, cucumbers, eggplants, garden mums, green beans, green onions, okra, peanuts, peppers, pumpkins, st. augustinegrass, sweet potatoes, tomatoes, watermelons, winter squash, zoysiagrass, zucchini
April
Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, okra, peanuts, st. augustinegrass, zinnias, zoysiagrass
August
Plant for fall: brussels sprouts, peppers, potatoes, sweet corn, tomatoes
September
Plant for fall: bearded irises, beets, broccoli, brussels sprouts, cabbages, carrots, cauliflower, collard greens, cucumbers, green beans, lettuce, peas, peppers, radishes, snapdragons, spinach, sweet corn, swiss chard, turnips, zucchini
October
Start indoors: onions
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hydrangeas, kale, kentucky bluegrass, lettuce, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, snapdragons, spinach, swiss chard, tall fescue, tulips, turnips
November
Start indoors: broccoli, cabbages, cauliflower, collard greens, kale, leeks, onions, oregano, parsley, petunias, ranunculus, rosemary, snapdragons
Plant for fall: cabbages, cauliflower, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, saffron, spinach, tall fescue, tulips
December
Start indoors: 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
Plant or sow outdoors: asparagus, black-eyed susans, blueberries, garlic, grapes, grass seed, green onions, hollyhocks, kentucky bluegrass, onions, peas, poppies, raspberries, rhubarb, strawberries, sweet peas, tall fescue, turnips, wildflowers
Plant for fall: crocuses, daffodils, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips
Frost dates and zones by ZIP code in Casa Grande
All 3 of Casa Grande's main ZIP codes take their frost dates from Casa Grande, so the dates on this page apply across the city. Every one of them is in zone 9a.
Planting dates for popular crops in Casa Grande
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Jan 5 to 19 | Mar 2 to 16 | Aug 23 to 30 |
| Strawberries | — | Dec 25 to Jan 8 | — |
| Lettuce | Dec 11 to 25 | Jan 29 to Feb 12 | Sep 6 to Oct 11 |
| Cilantro | Dec 25 to Jan 8 | Feb 5 to 12 | — |
| Basil | Jan 12 to 26 | Mar 2 to 9 | — |
| Potatoes | — | Jan 15 to 22 | Aug 16 to 23 |
| Garlic | — | Dec 25 to Jan 8 | Dec 6 to 20 |
| Onions | Oct 16 to Nov 27 | Jan 8 to 22 | — |
| Cucumbers | Feb 2 to 16 | Mar 2 to 16 | Sep 6 to 20 |
| Pumpkins | Feb 2 to 16 | Mar 2 to 16 | — |
| Peppers | Dec 15 to Jan 12 | Mar 2 to 16 | Aug 16 to Sep 13 |
| Carrots | — | Jan 15 to Feb 5 | Sep 13 to Oct 4 |
| Sweet Potatoes | — | Mar 22 to 29 | — |
| Watermelons | Jan 26 to Feb 9 | Mar 2 to 16 | — |
| Sweet Corn | — | Feb 5 to 19 | Aug 30 to Sep 13 |
| Green Beans | — | Mar 2 to 16 | Sep 13 to 20 |
| Zucchini | Feb 2 to 16 | Mar 2 to 16 | Sep 13 to 27 |
| Broccoli | Nov 20 to Dec 11 | Jan 8 to 22 | Sep 20 to Oct 18 |
| Peas | — | Dec 25 to Jan 8 | Sep 13 to 27 |
| Spinach | Dec 25 to Jan 1 | Jan 29 to Feb 12 | Sep 27 to Nov 1 |
| Sunflowers | — | Feb 5 to 26 | — |
| Zinnias | Mar 18 to 25 | Apr 15 to 29 | — |
| Tulips | — | — | Oct 25 to Dec 20 |
| Daffodils | — | — | Oct 25 to Dec 6 |
| Grass Seed | — | Dec 25 to Jan 8 | Oct 25 to Nov 8 |
Nearby cities
- Maricopa, AZ zone 9a, last frost Feb 23
- Queen Creek, AZ zone 9b, last frost Feb 1
- Chandler, AZ zone 9b
- Gilbert, AZ zone 9b
- Mesa, AZ zone 9b
- Tempe, AZ zone 9b
Planting in ArizonaAbout zone 9aPrintable calendar for Casa Grande
Questions
When is the last frost in Casa Grande?
Around February 5 in a typical year, based on NOAA's 1991-2020 records for Casa Grande. There is still a 1 in 10 chance of frost after February 28.
What planting zone is Casa Grande in?
USDA hardiness zone 9a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in Casa Grande?
Start seeds indoors January 5 to 19 and set plants out March 2 to 16.
When is the first frost in Casa Grande?
Around December 6 in a typical year, and before November 18 about 1 year in 10.