Local planting guide · Southwest
zip 85004
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 gardening operates under a constraint nearly opposite to most American gardening zones: the risk is not frost, but extreme summer heat. With a last spring frost of January 5 and a first fall frost of January 3, the growing season spans essentially the entire year. USDA zone 10a's winter lows of 30–35°F pose minimal threat to most established plants. The city's year-round growing season makes it possible to cultivate crops continuously, but success depends on matching varieties and planting times to seasonal heat and water availability. Pomegranates, Asian persimmons, and figs thrive in the heat that inhibits traditional stone fruits elsewhere. Warm-season vegetables like tomatoes, peppers, and eggplant grow vigorously in spring and fall but become stressed during the 115°F-plus summer months when heat causes flower and fruit drop. Year-round productivity requires strategic succession planting, careful variety selection for heat tolerance, and aggressive water management that accounts for the desert's low humidity and intense sun.
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
The single most limiting factor for Phoenix gardeners is sustained summer heat above 110°F, which prevents flowering and fruit set in many crops even with adequate water. Tomatoes and peppers commonly abort flowers and fail to develop fruit during June through August, forcing growers to time plantings for spring and fall harvests instead. Water availability and cost are structural constraints across Phoenix gardening, while heat-stressed plants become susceptible to spider mites and other pests that thrive in dry conditions. Alkaline soil and hard water present pH challenges for plants that prefer acidic conditions, requiring either soil amendment or selection of pH-tolerant varieties. Late-season frosts after January 5 occasionally occur and can damage tender new growth on early-planted cool-season crops. Summer pest pressure from spider mites and whiteflies intensifies as heat and low humidity create ideal conditions for reproduction.
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 plantings for early spring (February–March) and midsummer (July–August) to maximize harvests while avoiding the critical flower-abort window of peak heat (June–July). This two-season approach yields both spring and fall crops without the waste of failed summer plantings. Establish heat-loving perennials like figs, pomegranates, Asian persimmons, and goji berries as the foundation; they reduce annual replanting effort, tolerate alkaline soil, and endure summer heat that defeats annuals. Install 30–50% shade cloth in May, maintain 3–4 inches of mulch, and use drip irrigation on timers to deliver consistent moisture during the 115°F-plus summer peaks; this combination moderates soil temperature, reduces water loss, and prevents the stress-induced susceptibility to pests and disease that plague hand-watered gardens.
Frequently asked questions
- What are the best crops to grow year-round in Phoenix?
Heat-loving perennials like figs, pomegranates, Asian persimmons, and goji berries thrive once established and require minimal seasonal adjustment. For annuals, plant cool-season crops (lettuce, brassicas, root vegetables) in fall and early spring; warm-season crops (tomatoes, peppers, eggplant) in early spring and mid-August to avoid peak summer heat.
- When should I plant tomatoes in Phoenix?
Plant tomatoes in early spring (February–March) for April–May harvest and again in mid-August for September–December harvest. Avoid planting for summer production; temperatures above 95°F at night cause flower drop and poor fruit set, regardless of water availability.
- How do I protect plants from Phoenix's summer heat?
Use 30–50% shade cloth draped over frames starting in May, maintain 3–4 inches of mulch, and install drip irrigation on timers for consistent watering. Water deeply and less frequently to encourage deep rooting; afternoon sprinkling invites fungal problems in warm soil.
- Is frost damage a real concern in Phoenix?
Frost risk is minimal; the last spring frost occurs around January 5, so tender transplants planted after early January are generally safe. However, occasional late frosts can damage tender new growth on early-spring-planted crops, so monitor forecasts and protect young plants if frost is predicted.
- What soil amendments does Phoenix gardening require?
Phoenix's alkaline soil requires sulfur to lower pH for acid-loving plants, or select pH-tolerant varieties instead. Work in compost annually to improve water retention and add organic matter, which buffers temperature extremes and improves nutrient availability.
- Can I grow vegetables through Phoenix's summer?
Most vegetables struggle during peak summer (June–August) because heat above 110°F causes flower drop and plant stress. Shade-tolerant herbs and some greens can survive summer in deep shade, but expecting heavy vegetable production is unrealistic. Plan summer as a maintenance period, or focus on established perennials and fruit trees.
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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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