Local planting guide · Southwest
zip 85074
Phoenix is in USDA hardiness zone 10a, with average winter lows of 30°F to 35°F. The local growing season runs roughly 01/05 through 01/03 (~365 days). This zip falls within the Southwest growing region.
- USDA zone
- 10a 30°F to 35°F
- Last spring frost
- 01/05
- First fall frost
- 01/03
- Growing season
- 365 days
- Compatible crops
- 28
- Growing region
- Southwest
Right now in Phoenix
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Phoenix
Phoenix's defining gardening advantage is year-round frost protection; NOAA data shows frost risk only in early January (January 3-5), with a 365-day growing season. This is exceptional even among zone 10a locations. However, extreme heat, not frost, is the binding constraint. Summer temperatures regularly exceed 110°F (43°C), which kills or stresses many crops that would thrive 50 miles north. This flips the usual temperate gardening calendar upside down. Spring crops (tomatoes, peppers, eggplants) succeed October through May; many bolt, stop producing, or become pest-ravaged by June heat. Tender evergreens like avocado and citrus mature reliably here, as do heat-lovers: figs, pomegranates, Asian persimmons, goji berries, and dates. Winter is cool enough for cool-season crops (lettuce, broccoli, garlic) from November through March. The trade-off: traditional summer gardens of basil and green beans thrive only in shoulder seasons.
Regional context · Southwest
What the Southwest brings to Phoenix
Hot, arid, irrigated. Two growing seasons in the low desert: cool October to April, hot May to September. Date palms and citrus thrive at low elevation; apples and stone fruit at higher elevations. The chile-pepper belt of the country.
Common challenges
Issues that most often defeat home gardeners in zone 10a, drawn from the broader USDA zone profile.
- ▸ No chilling for traditional temperate fruit
- ▸ Hurricane exposure
- ▸ Heat-tolerant cultivars only
What defeats new gardeners in Phoenix
Phoenix gardeners face three distinct obstacles. First, the summer heat window (June-September) is hostile to most fruiting crops; tomatoes stop flowering above 90°F, peppers struggle above 105°F, and many vegetables bolt or decline in quality. Recovery is possible with afternoon shade cloth and consistent water, but it requires active management. Second, alkaline, compacted desert soil (often pH 8.0 or higher) limits nutrient availability, especially iron and zinc, causing yellowing leaves in otherwise healthy plants. Soil amendment is necessary before establishing permanent crops. Third, the brief January frost risk arrives suddenly and can damage tender citrus, tropical plants, or early-sprouted tender growth if not protected; monitoring the 10-day forecast from late December through mid-January is essential.
Crops that grow in Phoenix
28 crops from our catalog match zone 10a, grouped by type.
Tree fruit
12 crops
zone 10a Fig
Ficus carica
zones 7a–10b
zone 10a Asian Persimmon
Diospyros kaki
zones 7a–10a
zone 10a Pomegranate
Punica granatum
zones 7b–10a
zone 10a Lemon
Citrus limon
zones 9a–11b
zone 10a Orange
Citrus sinensis
zones 9a–11b
zone 10a Lime
Citrus aurantiifolia
zones 9b–11b
zone 10a Grapefruit
Citrus paradisi
zones 9a–11b
zone 10a Avocado
Persea americana
zones 9b–11b
Berries
3 crops
Nuts
1 crop
Vegetables
10 crops
zone 10a Tomato
Solanum lycopersicum
zones 3a–10b
zone 10a Sweet Pepper
Capsicum annuum
zones 4a–10b
zone 10a Hot Pepper
Capsicum species
zones 4a–10b
zone 10a Eggplant
Solanum melongena
zones 5a–10b
zone 10a Cucumber
Cucumis sativus
zones 3b–10a
zone 10a Summer Squash
Cucurbita pepo
zones 3b–10a
zone 10a Melon
Cucumis melo
zones 5a–10a
zone 10a Watermelon
Citrullus lanatus
zones 5b–10a
Herbs
2 crops
Plan the year
Planting calendar for Phoenix
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Phoenix's local frost dates.
Week ? · loading
This week in Phoenix, AZ (zone 10a)
Quiet week in Phoenix, AZ (zone 10a). this week is a good time to step back and plan ahead.
Nothing critical on the calendar this week.
147 bars · 28 crops
Calendar logic combines NOAA frost normals with crop-specific timing data. Local microclimate and weather always overrules the calendar; use this as a starting point.
Top pests for zone 10a
Ranked by how many crops in your zone they affect. Click through for IPM controls and signs to watch for.
Pseudococcidae spp.
Soft white waxy insects that cluster at leaf joints, fruit stems, and root crowns. Honeydew secretion supports sooty mold; root mealybugs cause decline that mimics drought.
Meloidogyne species
Microscopic soil-dwelling worm that forms galls on roots, reducing vigor and yield.
Multiple species (Aphididae)
Small soft-bodied sap-sucking insects that reproduce explosively in spring. Excrete honeydew that supports sooty mold and attracts ants. Transmit viral diseases.
Multiple species (Aleyrodidae)
Tiny white moth-like flying insects that feed on plant sap and excrete honeydew. Transmit numerous viral diseases including tomato yellow leaf curl virus.
Coccoidea spp.
Sap-sucking insects that attach to bark, leaves, and fruit, secreting honeydew that fuels sooty mold. Heavy infestations weaken trees and cause leaf yellowing.
Tetranychus urticae
Tiny mite that feeds on leaf undersides, causing stippling and webbing during hot dry weather.
Ceratitis capitata
Quarantine pest in many regions. Adult females puncture ripening fruit to lay eggs; larvae tunnel through the flesh, causing premature drop and rot.
Multiple species (Chrysomelidae)
Tiny black or bronze jumping beetles that put hundreds of small holes in seedling leaves. Most damaging on direct-seeded brassicas and young eggplant.
Top diseases for zone 10a
Ranked by how many crops in your zone they affect. Click through for symptoms, controls, and resistant varieties.
Capnodium spp.
Black fungal coating that grows on honeydew secreted by aphids, scale, mealybugs, and whiteflies. Doesn't infect plant tissue directly but blocks photosynthesis and disfigures fruit.
Cucumber mosaic virus, Tobacco mosaic virus, and others
Family of plant viruses producing mottled yellow-and-green leaf patterns. Vectored primarily by aphids; some are seed-transmitted or spread by handling tools and tobacco products.
Calcium deficiency physiological disorder
Not a true disease but a calcium-uptake disorder caused by inconsistent soil moisture during fruit development. The dominant cause of damaged first-fruit on home tomato plantings.
Sclerotium rolfsii
Soil-borne fungal disease most damaging in warm humid Southern conditions. White mycelial fans and small mustard-seed-sized sclerotia at the soil line are diagnostic.
Pythium and Rhizoctonia species
Soil-borne complex of water molds and fungi that kill seedlings before or shortly after emergence. The single most common cause of seed-starting failures.
Fusarium oxysporum
Soil-borne fungal disease that plugs vascular tissue and kills affected plants. Persists in soil for many years; impossible to eliminate once established.
Colletotrichum gloeosporioides
Most damaging mango disease worldwide. Fungal spores infect blossoms and developing fruit during humid weather, producing black sunken lesions that expand on ripening fruit.
Multiple species (Erysiphales)
Surface-feeding fungal disease producing white powdery growth on leaves and stems. Reduces yield by stealing photosynthate and accelerating senescence.
Companion planting suggestions
Beneficial pairings drawn from companion data, filtered to crops that grow in zone 10a.
- Fig + Rosemary
Rosemary tolerates the dry sites figs prefer and provides aromatic pest deterrence.
- Tomato + Basil
The classic Italian pairing. Basil's volatile oils are reported to repel hornworms and whiteflies, and the two crops share the same warm-season schedule and water needs. Plant basil between tomato cages.
- Sweet Pepper + Basil
Same warm-season culture, same watering schedule. Basil reportedly improves pepper flavor and repels aphids and thrips that are pepper's primary pests.
- Hot Pepper + Basil
Compatible heat-loving culture, similar water needs. Basil interplanted between hot pepper plants supports beneficial insects and reduces aphid pressure.
- Okra + Hot Pepper
Both heat-loving warm-season crops with similar water and fertility needs. Hot pepper at okra's base benefits from the slight afternoon shade in extreme summer heat.
Soil types reference
Soil texture and pH decide what grows easily on your specific lot. Find the closest match below for crop recommendations and amendment guidance.
Practical tips for Phoenix
Monitor the January frost window (around January 3-5) with a thermometer. Frost cloth or burlap draped loosely over tender perennials provides 2 to 4 degrees of frost protection when overnight lows approach freezing. Shift your annual crop calendar entirely: plant heat-sensitive crops (tomatoes, peppers, eggplants, root crops) from September through December for fall-into-spring harvest; a secondary spring planting (February-March) produces before heat stress sets in by May-June. For reliable year-round production, lean on heat-adapted varieties: 'Black Afghan' and 'Chicago Hardy' figs, 'Wonderful' pomegranate, Asian persimmons, and goji berries produce prolifically and tolerate Phoenix's heat and alkaline soil.
Frequently asked questions
- When is the best time to plant tomatoes in Phoenix?
Plant tomatoes from late September through October for an October-through-May season, avoiding the June-September heat spike. A secondary spring planting (February-March) works if you accept earlier bolting or use afternoon shade cloth. Summer tomatoes are possible but require daily shade cloth and supplemental water.
- Why can I grow figs and pomegranates so easily when other gardeners struggle?
Figs and pomegranates evolved in Mediterranean and semi-arid climates and thrive in Phoenix's heat, alkaline soil, and dry conditions. Other zone 10a regions (southern Florida, coastal California) have humidity, winter rain, or cooler summers that these crops tolerate but don't require. Phoenix's extreme summer heat is their sweet spot.
- When do I need to protect plants from frost?
Frost risk in Phoenix clusters around early January (January 3-5 per NOAA data). Monitor 10-day forecasts from late December through mid-January; cover tender citrus, tropical plants, and early leafing shrubs when overnight lows approach 32°F. Frost cloth or burlap draped loosely provides 2 to 4 degrees of protection.
- What's the biggest challenge for home gardeners in Phoenix?
Summer heat and timing. Most home gardeners plant spring crops too late (April-May) and watch them decline by June. Success requires planting tomatoes, peppers, and eggplants in September-October, not spring, to front-load production into the mild winter months.
- Can I grow the same vegetables year-round?
No. Heat-sensitive crops (lettuce, broccoli, peas, beans) thrive October-March; heat-lovers (eggplant, okra, peppers) are viable September-May with heat stress mid-June through August. Succession planting the same crop across two seasons (fall and spring) is the standard approach in Phoenix.
- What can I grow in Phoenix's brutal summer?
Armenian cucumber, yard-long beans, okra, sweet potato, and goji berries tolerate or thrive in heat. Citrus, figs, pomegranates, and dates produce year-round. Most heat-stressed edibles need afternoon shade cloth (30-50%) and consistent irrigation to set fruit reliably.
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Frost data: NOAA Climate Normals 1991-2020, station USW00023183. Local microclimates can shift these dates by a week or more.
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