When to Plant Peppers in Arizona
Published: April 21, 2026
Arizona gardeners in Zone 9b enjoy an extended 50-week growing season for pepper. Warm-climate gardeners can grow two pepper crops — a spring planting and a fall planting — with summer heat as the main challenge to work around. This guide gives exact dates for Arizona based on your local frost calendar.
Pepper Planting Dates for Arizona
| Start seeds indoors | November 20–27 |
| Last frost (average) | January 15 |
| Transplant outdoors | January 29–February 8 |
| Expect first harvest | March 30 – April 29 |
| 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.
Growing Peppers in Arizona's Climate
Arizona's warm Zone 9b climate gives pepper more than enough heat — in fact, peak summer heat (95°F+) can shut down fruit set entirely. The solution most Arizona gardeners use is a two-season approach: a spring crop planted early, a harvest break during peak summer, and a fall crop planted July through August for October and November harvest.
Variety selection matters more in warm climates than most gardeners realize. Choose heat-tolerant varieties bred for Arizona-like conditions — local extension offices and nurseries stock these specifically. Afternoon shade cloth during July and August can be the difference between a working fall crop and total flower drop.
Common pepper pests to watch for in Arizona include Aphids and Pepper Weevil. The first line of defense is companion planting: Basil and Tomato 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.
Pepper Garden Calendar for Arizona
| Month | Task | Notes |
|---|---|---|
| January | Transplant outdoors | Soil temp must be 65°F+; nighttime lows above 50°F |
| February | — | Off-season |
| March | First harvest window opens | Pepper begins producing 60–90 days after transplant |
| April | — | Off-season |
| May | — | Off-season |
| June ← | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Continue care | Consistent watering; remove yellow leaves |
| August | — | Off-season |
| September | — | Off-season |
| October | — | Off-season |
| November | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| December | First frost approaches | Harvest remaining pepper; cover plants on frost nights |
Pepper Growing Tips for Arizona Gardeners
- •Start indoors 8 full weeks before last frost — peppers are the slowest vegetable to establish from seed.
- •Nighttime temps must stay consistently above 55°F before transplanting — cold nights halt growth.
- •Arizona's summer heat shuts down pepper flowering at 95°F+. Choose heat-tolerant varieties and use shade cloth from mid-June through August to preserve fruit set.
- •Use a bloom fertilizer (low nitrogen, higher phosphorus) once flowering begins for best fruit set.
Companion Planting for Peppers in Arizona
In Arizona's warm climate, planting pepper with Basil and Tomato helps deter pests and improve soil. Avoid planting near Fennel and Brassicas, which inhibit pepper growth through root chemistry or shared pest pressure. See the full pepper companion planting guide for the complete list.
Peppers 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 pepper in Arizona?
In Arizona (Zone 9b), start pepper seeds indoors around November 20–27 and transplant outdoors around January 29–February 8 — 2 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 pepper year-round in Arizona?
Not year-round — Arizona's cold season stops pepper production. The pepper season runs January 15 to December 31, roughly 50 weeks.
What pepper varieties grow best in Arizona?
For Arizona's Zone 9b, Heat-tolerant California Wonder, Big Bertha, and Cubanelle produce even through peak heat.
When do I start pepper seeds indoors in Arizona?
Start pepper seeds indoors in Arizona around November 20–27, which is 8 weeks before the state's average last frost of January 15. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.