Local planting guide · Southwest
zip 85034
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 calendar runs year-round, but the region's extreme heat and aridity make it fundamentally different from temperate zones. Frost is not a constraint (minimum temperatures hover around 30-35°F, with freezing confined to early January), but the desert's summer brings daily highs exceeding 120°F. This heat, not cold, is the defining challenge. Phoenix gardeners have access to a 365-day growing season, but only certain crops and varieties thrive in such extreme conditions.
Crops suited to this environment include drought-tolerant species like fig, pomegranate, and goji berry, which prefer Mediterranean climates and tolerate both heat and minimal water. Warm-season vegetables like tomatoes, peppers, and eggplant succeed in Phoenix but require heat-tolerant varieties and careful management to prevent blossom drop when nighttime temperatures remain above 80°F year-round. The mild winters make late-fall and winter planting viable for cool-season crops that would normally fail in hotter zones. The inverted calendar (main vegetable season November through April) is the key to productive gardening in Phoenix.
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 summer heat is the primary challenge. Temperatures regularly exceed 115°F from June through August, disrupting pollination in tomatoes and peppers and causing flowers to abort before setting fruit. Many varieties marketed nationally assume cooler nights and fail here. Soil pH is typically 8.0 or higher (alkaline), which locks up micronutrients and causes chlorosis in acid-loving plants.
Water scarcity compounds both issues. Phoenix averages only 8 inches of rain annually, and many neighborhoods enforce strict summer irrigation limits. Shallow-rooted plants and sandy soils exacerbate water stress. Even cold-tolerant crops like figs struggle if water dries up during fruit development in early summer.
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 by the inverted calendar. Sow heat-sensitive crops in late summer or early fall (August-September) so they're established before peak heat, or switch to cool-season varieties in fall and let them mature through winter. Tomato and pepper seeds started indoors in December-January bloom in spring, set fruit, and finish by late May before heat peak.
Choose heat-bred varieties. Select tomato and pepper varieties bred for low-humidity, high-heat regions, not Pacific Northwest cultivars. 'Phoenix' and 'Heatwave' series peppers are specifically developed for the Southwest. Stone fruits and pomegranates should be low-chill varieties that don't require extended winter cold.
Amend soil and mulch heavily. Add sulfur or compost to lower soil pH and improve water retention in sandy desert soils. Apply 3-4 inches of mulch to reduce evaporation and keep roots cooler during summer.
Frequently asked questions
- What crops should I prioritize in Phoenix?
Figs, pomegranates, goji berries, and Mediterranean herbs thrive in heat and drought. For vegetables, heat-tolerant tomato and pepper varieties, eggplant, and Armenian cucumber excel. Cool-season crops like lettuce, kale, and broccoli succeed only November through March.
- When should I plant tomatoes and peppers in Phoenix?
Start seeds indoors in December or January and transplant in February-March so plants mature before late-May heat suppresses flowering. For fall harvest, succession-plant in August-September for light production in November-December.
- Is frost a major concern?
Freezing temperatures are rare and confined to early January. After the first week of January, frost is essentially non-existent, making winter crops planted October-November safe through February.
- What's the biggest weather risk for gardens?
Summer heat above 115°F causes flower and fruit abortion in tomatoes, peppers, and many stone fruits. Heat-tolerant varieties and consistent irrigation during fruit development are critical.
- How do I manage alkaline soil?
Add sulfur or aluminum sulfate annually to gradually lower pH, or grow acid-loving plants in containers with acidic soil. Compost helps, though results are slow in desert soils.
- What irrigation strategy works best in Phoenix?
Drip-irrigate at soil level to minimize evaporation, mulch heavily (3-4 inches), and group plants by water need. Phoenix receives only 8 inches of rain annually, so supplemental water is essential during fruit development.
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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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