Local planting guide · Southwest
zip 85005
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 gardeners enjoy an exceptionally long growing season, with frost risk concentrated in early January and growing conditions suitable for crops nearly year-round. As a zone 10a location, Phoenix experiences average annual minimum temperatures of 30 to 35 degrees Fahrenheit (NOAA Climate Normals 1991-2020), allowing frost-sensitive plants to thrive outdoors through most of the year. The real defining constraint is not frost but heat; summer temperatures regularly exceed 100 degrees Fahrenheit for months, which diverges sharply from other zone 10a regions. Winter (November through March) is the prime planting season, when cool-season vegetables and greens flourish with minimal pest pressure and moderate water demand. Fig, Asian persimmon, pomegranate, and goji berry all grow reliably here, while tomatoes, peppers, and eggplant require careful timing or heat protection. The 365-day growing season is less a continuous advantage and more a tale of two seasons: winter is abundant, and summer demands heat tolerance or strategic shade.
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
Summer heat is the first obstacle. From June through August, sustained temperatures above 100 degrees Fahrenheit cause sunburn on developing fruit, wilt sensitive foliage, and trigger early bolting in planted cool-season crops. Tomatoes and peppers planted too late in spring deteriorate before fruit sets; eggplant survives but produces less. The second challenge is the narrow frost window in early January. Although frost is limited (last spring frost January 5, first fall frost January 3), tender perennials planted in early fall can still suffer damage if an unexpected cold snap arrives. Third, water stress compounds heat stress; the desert environment means irrigation is non-negotiable, and mulch becomes 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
Plant cool-season vegetables (tomatoes, brassicas, leafy greens) in August and September for fall and winter harvest, avoiding the worst of summer heat and allowing plants to mature when water uptake is most efficient. For warm-season crops like peppers and eggplant, install 30 to 50 percent shade cloth by May to protect developing fruit from sunburn; remove cloth by late September as temperatures drop. The minimal frost risk (confined to early January) allows an extended planting calendar compared to colder zones, but the brutal summer heat makes winter the real growing season. Plan crop rotations around this rhythm rather than conventional spring-and-fall cycles.
Frequently asked questions
- When is the best time to plant tomatoes in Phoenix?
Plant tomatoes in late August to early September for fall and winter harvest. Spring plantings (February-March) must mature before June heat arrives; avoid planting in late spring since young plants cannot survive 100-degree-plus summer temperatures.
- What crops grow best during Phoenix winters?
Cool-season vegetables thrive from November through March, including brassicas (cabbage, broccoli, kale), leafy greens (lettuce, spinach, chard), root vegetables (carrot, beet, radish), and legumes. These crops produce abundantly with minimal pest pressure and require less water than summer crops.
- How do I protect warm-season crops from summer heat?
Use shade cloth (30 to 50 percent density) from May through September to reduce sunburn and heat stress on peppers, eggplant, and fruiting crops. Drip irrigation and heavy mulch are equally critical for maintaining consistent soil moisture during sustained heat.
- When will frost damage plants in Phoenix?
Frost risk is concentrated in early January, with the last spring frost around January 5 and the first fall frost around January 3. This narrow window poses minimal threat to most tender plants, but establish frost cloth or row covers as insurance for frost-sensitive perennials.
- Can I grow citrus in Phoenix?
Yes. Citrus thrives in zone 10a as a perennial crop. Plant in early fall (August-September) to establish strong root systems before winter. Provide frost protection only during the narrow January frost window; otherwise, citrus is one of Phoenix's most reliable crops.
- What's the hardest month for Phoenix gardeners?
July and August are the most challenging months. Few crops tolerate sustained 110-degree-plus heat, and water demand peaks when supply is most constrained. Many gardeners leave gardens dormant and plan succession plantings for fall instead.
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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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