Local planting guide · Southwest
zip 85010
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 growing season officially spans 365 days, but the reality is more nuanced than the frost dates suggest. Winter lows rarely drop below 30°F, so tropical and subtropical crops like figs, Asian persimmons, pomegranates, and goji berries establish easily and thrive. The real constraint is not cold but heat: summer temperatures regularly exceed 110°F, which shuts down reproduction in most temperate crops.
The practical gardening season splits into two: October through April offers ideal conditions for the crops most people think of, tomatoes, peppers, leafy greens, root crops, with daytime highs in the 60s through 80s. May through September is the dormancy season for heat-sensitive plants, though heat-adapted crops like eggplant and pomegranate thrive. Water becomes the second constraint: even with 365 frost-free days, irrigation demands in Phoenix rival desert farming elsewhere.
Gardeners here succeed not by ignoring frost hardiness but by working with an inverted growing pattern compared to most of the country.
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 kills or sterilizes most traditional crops. Tomatoes planted in spring will grow vigorously through April, then fail to set fruit once daytime temperatures exceed 95°F in late May or early June. Peppers and eggplants tolerate heat better but still require afternoon shade by June.
The second challenge is alkaline soil: Phoenix's native desert soil runs pH 7.5 to 8.5, while most vegetables require pH 6.0 to 7.0. Amending even a small garden bed to neutral pH is labor-intensive. The third is water: municipal restrictions during peak summer limit how much supplemental irrigation is feasible, yet summer heat multiplies evaporation. Combine all three and many gardeners give up on summer gardening, which is actually the rational approach, the season for this zip code is autumn through spring.
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 tomatoes and peppers in late August or early September for a winter harvest cycle, not in spring as most gardening guides suggest. By the time heat arrives in late May, plants will be mature and winding down, avoiding the worst of the heat-induced sterility.
Use 30% to 50% shade cloth from May through September for valuable crops and established fruit trees; the ultraviolet intensity in Phoenix deserves this investment. Install drip irrigation on a timer before summer arrives; hand-watering cannot keep up with evaporation rates above 100°F, and inconsistent watering stresses plants and invites pest problems.
Frequently asked questions
- What are the best crops to grow in Phoenix zone 10a?
Figs, pomegranates, Asian persimmons, and goji berries tolerate both mild winters and brutal summers. Tomatoes and peppers thrive in winter (planted September-October) but struggle in summer heat. Eggplant is the summer heat-lover that produces when other crops shut down. Greens and root crops thrive October through April.
- When should I plant tomatoes in Phoenix?
Plant tomatoes in late August or early September for a winter harvest cycle, not in spring. Spring-planted tomatoes stop setting fruit by June when heat exceeds 95°F. Fall-planted tomatoes mature through the ideal 60-80°F season and produce heavily November through March.
- What's the biggest weather risk for Phoenix gardeners?
Heat, not frost. Summer temperatures over 110°F shut down reproduction in most crops and drive water demand to unsustainable levels. Frost is so rare that it is almost a non-issue compared to managing a 5-month heat dormancy.
- My soil is very alkaline. Can I still grow vegetables?
Yes, but expect to amend heavily. Desert soils typically run pH 7.5 to 8.5; most vegetables need pH 6.0 to 7.0. Dig organic matter and sulfur into planting beds, or consider raised beds with amended soil to bypass native soil chemistry entirely.
- Is it worth installing shade cloth in Phoenix?
Absolutely. 30% to 50% shade cloth during May through September reduces heat stress, cuts water demand, and keeps plants alive through the worst months. Even established fruit trees benefit from temporary shade during peak summer.
- What about water restrictions in summer?
Phoenix's municipal water restrictions do limit supplemental irrigation during peak months. Drip irrigation is more efficient than sprinklers; mulch heavily to reduce evaporation; and choose drought-tolerant crops like pomegranate and goji for summer. The autumn-through-spring planting cycle also naturally reduces summer water pressure.
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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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