Local planting guide · Southwest
zip 85016
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 reality inverts conventional logic. Winter (December through February) is the prime growing season, not summer. The area's USDA zone 10a classification is driven by rare dips to 30-35°F, but in 85016, hard freezes are uncommon; the last spring frost typically arrives by January 5 and the first fall frost by early January, leaving a year-round window. The genuine constraint is summer heat. Daytime temperatures regularly exceed 110°F from June through August, effectively closing the garden to warm-season crops unless shade cloth or specialized irrigation techniques manage the conditions. Cool-season crops (leafy greens, broccoli, carrots, peas) thrive October through April. Warm-season staples like tomatoes, peppers, and eggplant can be grown in winter and spring or, with careful management, in late summer through fall. Perennial heat-lovers (figs, pomegranates, goji berries, Asian persimmons) flourish with minimal frost worry but demand strategic water management and variety selection for the desert environment.
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
Extreme summer heat stops most traditional gardening from June through August. Tomato production halts not from frost but from nighttime temperatures too warm for fruit set; blossom-end rot and sunscald are common consequences. Peppers similarly slow or stop flowering in peak heat. Cool-season crops planted for summer simply bolt or wilt. A second challenge is water availability and cost in the desert. Drip irrigation is essential; overhead watering invites disease and wastes water in dry air. Soil in 85016 tends toward alkaline pH and compaction. Desert pests (spider mites, aphids, whiteflies) thrive year-round and explode in warm months. Many home gardeners struggle to shift their mental calendar: winter, not summer, is prime planting time for most edibles.
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 the main edible garden for winter harvest. Sow tomatoes, peppers, eggplant, and cool-season crops in August and September to mature before December and early January frost risk (minimal as it is). This avoids summer's inferno and aligns with when plants actually thrive. Shade cloth (30-50% density) in April and May extends spring tomato and pepper production into early summer; remove it as plants naturally slow. Install drip irrigation on a timer and mulch heavily; desert soil dries within hours of watering. A winter-grown fig or pomegranate can bear through spring; summer heat then becomes a dormancy period or reduced-production phase rather than the main harvest window.
Frequently asked questions
- What's the best time to grow tomatoes in Phoenix 85016?
August through September for the winter crop (harvest December through February), or February through March for a spring crop before June heat arrives. Summer tomato growing is possible with aggressive shade cloth (50%+), but winter is the natural tomato season for most gardeners.
- Which crops grow most reliably in this zip code?
Cool-season crops (lettuce, broccoli, kale, carrots, peas) excel October through April. Warm-season crops (tomatoes, peppers, eggplant) thrive in winter and spring. Perennials like figs, pomegranates, and goji berries handle the heat and produce steadily with consistent water.
- Do I need to protect plants from frost?
Frost protection is rarely needed in 85016. The last spring frost typically arrives by January 5, and the first fall frost by early January, creating a nearly year-round frost-free window. Focus instead on managing summer heat and water.
- What's the biggest challenge for home gardeners in Phoenix?
Extreme summer heat (110°F+) halts production for most edibles and causes physiological problems like blossom-end rot in tomatoes. Many gardeners new to Phoenix expect summer to be growing season, then get discouraged. Winter is when the garden actually thrives.
- Is irrigation difficult in Phoenix?
Drip irrigation is nearly essential for success. Desert soil dries rapidly, and overhead watering wastes water and invites fungal disease. On a timer with heavy mulch, drip systems keep plants consistent with minimal effort.
- Can I grow heat-loving crops like eggplant and peppers year-round?
Best results come from growing them in winter and spring. Summer heat (110°F+ nighttime temperatures) slows or stops flowering and fruit set. Shade cloth extends the season, but winter remains the primary productive period.
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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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