Local planting guide · Southwest
zip 85072
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 gardening reality diverges sharply from traditional American growing zones. With a 365-day growing season and frost dates bracketing early January, the city experiences nearly continuous opportunity to grow food. Winter lows average 30-35°F, so true freezes are rare and brief. The dominant constraint is not cold but extreme heat. From June through August, temperatures routinely exceed 110°F, a threshold where most traditional vegetables stress, drop flowers, and struggle with fruit set. This creates an inverted calendar: tomatoes, peppers, and eggplants thrive when grown in the cooler months (November through March), not summer. Conversely, heat-loving perennials like figs, pomegranates, and goji berries flourish during the intense months when cool-season crops would wilt. Phoenix gardeners succeed by accepting the desert's rhythms rather than fighting them.
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
Late-season frost remains a periodic risk. While January 5 is the official last spring frost date, rare cold snaps in January can still damage newly planted warm-season crops. The second challenge is heat-induced flower drop in tomatoes and peppers planted during spring months. Outdoor plantings made in March through May often flower prematurely, then abort fruit when temperatures exceed 110°F in June and July. Finally, Phoenix's alkaline, caliche-prone soil with low organic matter causes widespread nutrient deficiencies. Many crops display iron chlorosis (yellowing leaves with green veins) without soil amendment, and native groundwater is often highly mineralized.
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
Time tomato and pepper planting for fall harvest, not summer production. Sow seeds indoors in July and August, transplant in September, and target harvest from November through March when cooler temperatures support fruit set and flavor development. Traditional spring planting (March to May) results in premature flowering and aborted fruit. Second, exploit the long growing season with succession planting. Summer crops like eggplant can be planted in late June and harvested before frost risk near January 3. Third, dedicate space to heat-loving perennials. Figs, pomegranates, and goji berries tolerate the extreme heat that defeats annual crops, anchoring a landscape while cool-season vegetables rotate through annual cycles.
Frequently asked questions
- When is the best time to grow tomatoes in Phoenix?
Fall through spring, not summer. Sow seeds in July or early August indoors, transplant in September, and harvest from November through March. Summer planting fails because heat exceeds optimal fruit-set temperatures.
- What crops grow reliably year-round in Phoenix?
Heat-loving perennials like figs, pomegranates, Asian persimmons, and goji berries tolerate Phoenix's summer extremes. Herbaceous crops rotate by season: cool-season vegetables (lettuce, broccoli, root crops) in winter and tomatoes, peppers, eggplant in fall and spring.
- Is frost protection necessary in January?
Rarely, but January 5 marks the official last spring frost date. Monitor weather forecasts and keep frost cloth available for unexpected cold snaps. Most years, frost is not a concern after early January, but new transplants remain vulnerable.
- How do I manage alkaline soil and iron chlorosis?
Amend heavily with sulfur and organic matter to lower pH. Apply chelated iron as a foliar spray when yellowing appears. Many crops perform better in containers with custom soil mixes than in native ground.
- Can I grow peppers and eggplant like traditional summer crops?
Technically yes, but they suffer. Plantings made in March or April produce a brief flush before June heat causes stress and flower drop. Fall planting (June through August) is far more productive in Phoenix's climate.
- What is the biggest weather risk for Phoenix gardeners?
Not frost, but summer heat stress. Protect tender crops with afternoon shade cloth from May through September. Plan around heat tolerance, not traditional American growing seasons.
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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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