When to Plant Peas in Arizona
Published: April 24, 2026
Arizona gardeners in Zone 9b enjoy an extended 50-week growing season for pea. Cool-season crops like pea do best in fall, winter, and early spring in Arizona — the hot summers bolt these plants before they can be harvested. This guide gives exact dates for Arizona based on your local frost calendar.
Pea Planting Dates for Arizona
| Start seeds indoors | Year-round |
| Last frost (average) | January 15 |
| Direct sow outdoors | December 11–21 |
| Expect first harvest | February 4 – February 19 |
| Fall crop start | October 22–November 1 |
| Fall harvest | December 16 |
| First fall frost (average) | December 31 |
Dates above assume Zone 9b, the most common zone in Arizona. Gardeners in cooler San Tan Valley (Zone 7b) plant 1–2 weeks later; warmer Tucson (Zone 9a) can plant 1–2 weeks earlier.
⚠ Plant peas 4–6 weeks before last frost — one of the first vegetables of spring. Tolerate light frost. Also plant in late summer for a fall harvest.
Growing Peas in Arizona's Climate
Arizona's warm Zone 9b climate makes pea a fall, winter, and early spring crop rather than a summer one. The cool-season window runs roughly October through April in Arizona — plant outside this window and the pea will bolt (send up a flower stalk and turn bitter) before it produces a harvestable crop.
Succession planting stretches the pea harvest window. Sow small amounts every two weeks from October through February — you will have staggered harvests rather than a single wave to process all at once. Bolt-resistant varieties extend the usable window an extra three to four weeks into warming weather.
Common pea pests to watch for in Arizona include Pea Aphid and Powdery Mildew. The first line of defense is companion planting: Carrot and Radish planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Pea Garden Calendar for Arizona
| Month | Task | Notes |
|---|---|---|
| January | — | Off-season |
| February | First harvest window opens | Pea begins producing 55–70 days after transplant |
| March | — | Off-season |
| April | — | Off-season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Off-season |
| July | — | Off-season |
| August | — | Off-season |
| September | — | Off-season |
| October | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| November | — | Off-season |
| December | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 3 inches apart |
Pea Growing Tips for Arizona Gardeners
- •Soak pea seeds overnight before planting to speed germination in cool soil.
- •Install a 4–6 foot trellis at planting time — peas climb from day one and produce more per square foot when supported.
- •Arizona's cool-season pea plants best in October, November, and December for winter and early spring harvest. Spring plantings bolt before producing a harvestable crop.
- •Sow every 2 weeks through early spring for a continuous 6-week harvest window.
Companion Planting for Peas in Arizona
In Arizona's warm climate, planting pea with Carrot and Radish helps deter pests and improve soil. Avoid planting near Onion and Garlic, which inhibit pea growth through root chemistry or shared pest pressure. See the full pea companion planting guide for the complete list.
Peas Planting Dates by City in Arizona
Top cities in Arizona — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant pea in Arizona?
In Arizona (Zone 9b), start pea seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of January 15.
What is the last frost date in Arizona?
Arizona's average last frost date is January 15 in the state's most common Zone 9b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow pea year-round in Arizona?
pea is a cool-season crop in Arizona, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What pea varieties grow best in Arizona?
For Arizona's Zone 9b, consult a local nursery or extension office for peas variety recommendations.
When do I start pea seeds indoors in Arizona?
Pea does not need indoor starting in Arizona — direct sow around December 11–21 once soil reaches 40°F. Indoor starting is not recommended for this crop because pea transplants poorly.