Local planting guide · Southwest
zip 85050
Phoenix is in USDA hardiness zone 10a, with average winter lows of 30°F to 35°F. The local growing season runs roughly 01/08 through 12/25 (~354 days). This zip falls within the Southwest growing region.
- USDA zone
- 10a 30°F to 35°F
- Last spring frost
- 01/08
- First fall frost
- 12/25
- Growing season
- 354 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 (zone 10a) sits at one extreme of the USDA zone map: winters are so mild that frost barely interrupts the growing season, with the last spring freeze on January 8 and the first fall freeze delayed until December 25. This creates a 354-day growing season, among the longest in the country. The actual limiting factor for Phoenix gardeners is not cold but extreme heat. Summer temperatures routinely exceed 110°F, which shuts down fruiting in many crops and demands heat-tolerant varieties or protective measures.
This heat-driven climate means Phoenix favors crops that most of zone 10a struggles with: figs, Asian persimmons, pomegranates, and goji berries thrive in the dry, intense sun. Summer vegetables like tomatoes, peppers, and eggplant are entirely viable but require strategic timing to avoid the deadest heat months (June through September). The same long season that enables year-round growing also means gardeners can plant two distinct crop cycles, one in spring and another in fall, with a hot-season break for true heat lovers.
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's biggest challenge is the 110°F+ summer heat, which halts flowering and fruit set in many vegetables from June through September. Tomatoes and peppers decline sharply when nighttime lows exceed 75°F; eggplant is more heat-tolerant but still drops flowers in extreme conditions. Constant irrigation becomes necessary during heat waves, and even drought-tolerant crops suffer from soil desiccation and low humidity.
The early January frost window, though brief (January 8 is the average last frost date), catches spring plantings that get ahead of schedule. Tender transplants set out in late December can lose buds or foliage in a single cold snap. Additionally, Phoenix's low humidity supports persistent spider mite populations on stressed plants and can trigger powdery mildew on certain crops despite the overall dry climate.
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
Two tomato planting windows, January through February and late July through August, maximize spring and fall harvests while avoiding the June-September heat shutdown. Each window yields a distinct crop cycle; spring plantings finish before peak heat arrives, while fall plantings extend from September through December.
Shade cloth (30 to 50 percent density) reduces canopy and soil temperatures by 10 to 15 degrees, enough to preserve fruit set in peppers, eggplant, and heat-sensitive tomato varieties from mid-May through September. This simple measure often means the difference between a productive crop and complete flower drop during peak heat.
Heat-tolerant varieties selected for desert climates significantly outperform general heat-tolerant types. Arizona-specific or Southwest-adapted varieties (tested in low-humidity, extreme-heat trials) are more reliable than Southeast heat-and-humidity selections that assume tropical moisture.
Frequently asked questions
- What crops grow best in Phoenix?
Figs, Asian persimmons, pomegranates, and goji berries flourish in zone 10a's heat and mild winters. For vegetables, heat-tolerant tomatoes, peppers (especially hot peppers), and eggplant perform well with summer shade. Leafy greens and root crops thrive in the cool-season windows from fall through spring.
- When should tomatoes be planted in Phoenix?
Tomato transplants perform best when set out in January or February for a spring crop finishing before June heat, or in late July for a fall crop carrying through December. Plantings in March-May or midsummer lead to flower drop and poor yields.
- How are plants protected from early January frost?
Although January 8 is the average last frost date, cold snaps can occur earlier in the month. Frost cloth kept ready through mid-January protects tender crops (peppers, basil, tender perennials) when temperatures approach 35°F.
- Is summer heat the main gardening challenge in Phoenix?
Yes. Phoenix summers (110°F+ days) halt fruiting in tomatoes, peppers, and squash despite the long season. Without shade cloth or heat-adapted varieties, these crops cease producing fruit for months. Heat, not cold, is the controlling factor.
- How do water restrictions affect Phoenix gardening?
Many Phoenix suburbs limit outdoor watering to 2 days per week. Drip irrigation and heavy mulch minimize waste and allow efficient watering within restrictions. Drought-tolerant crops like figs, pomegranates, and goji are better matches for Phoenix's water reality than water-intensive vegetables.
- Does citrus grow well in Phoenix?
Yes. Citrus thrives in zone 10a's heat. The main pest is citrus leaf miner, which causes cosmetic damage. Grapefruit, sweet orange, and lemon are reliable; frost protection is rarely needed except for young trees in January.
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Frost data: NOAA Climate Normals 1991-2020, station USW00003184. Local microclimates can shift these dates by a week or more.
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