Local planting guide · Southwest
zip 85032
Phoenix is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 01/06 through 12/26 (~353 days). This zip falls within the Southwest growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 01/06
- First fall frost
- 12/26
- Growing season
- 353 days
- Compatible crops
- 37
- 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 gardening is shaped by an exceptionally long growing season (353 days annually) and a late spring frost date of January 6, but the real constraint is heat intensity during the long summer months. The zone 9b winter minimum of 25 to 30 degrees F rarely poses a meaningful threat; midsummer conditions are far more limiting. Successful Phoenix gardeners depart from the traditional spring-planting calendar. Heat-tolerant perennials (figs, pomegranates, jujubes, Asian persimmons, goji berries) are reliable year-round. Cool-season crops (leafy greens, brassicas, root vegetables) thrive from October through April, a full six-month productive window driven by mild winter temperatures. The period from May through August is challenging for most annual vegetables and is often skipped or managed with shade techniques. The late frost date of January 6 requires careful timing; tender new growth on perennials can still be killed by freezing nights well into the calendar year. The first fall frost arrives very late (December 26), extending the harvest window for cool-season crops substantially compared to other zone 9b regions.
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 9b, drawn from the broader USDA zone profile.
- ▸ Heat stress in summer
- ▸ Insufficient chill for most apples
- ▸ Salt spray near coasts
What defeats new gardeners in Phoenix
Heat stress during summer months is the dominant challenge. Most annual vegetables (tomatoes, peppers, squash, beans) struggle or fail when exposed to intense midsummer conditions, particularly if planting occurs in May or June. The late spring frost around January 6 is a secondary constraint; gardeners who plant too early risk losing tender new growth. Alkaline soil is common across the Phoenix area, which can reduce micronutrient availability and favor certain pests. Finally, water availability becomes critical during midsummer; gardens that depend on consistent watering face either high utility costs or crop failure if restrictions are imposed.
Crops that grow in Phoenix
37 crops from our catalog match zone 9b, grouped by type.
Tree fruit
11 crops
zone 9b Fig
Ficus carica
zones 7a–10b
zone 9b Asian Persimmon
Diospyros kaki
zones 7a–10a
zone 9b Pomegranate
Punica granatum
zones 7b–10a
zone 9b Jujube
Ziziphus jujuba
zones 6a–9b
zone 9b Lemon
Citrus limon
zones 9a–11b
zone 9b Orange
Citrus sinensis
zones 9a–11b
zone 9b Lime
Citrus aurantiifolia
zones 9b–11b
zone 9b Grapefruit
Citrus paradisi
zones 9a–11b
Berries
2 crops
Vegetables
18 crops
zone 9b Tomato
Solanum lycopersicum
zones 3a–10b
zone 9b Sweet Pepper
Capsicum annuum
zones 4a–10b
zone 9b Hot Pepper
Capsicum species
zones 4a–10b
zone 9b Eggplant
Solanum melongena
zones 5a–10b
zone 9b Cabbage
Brassica oleracea var. capitata
zones 3a–9b
zone 9b Kale
Brassica oleracea var. acephala
zones 3a–9b
zone 9b Collards
Brassica oleracea var. acephala
zones 4a–9b
zone 9b Cucumber
Cucumis sativus
zones 3b–10a
Herbs
6 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 9b)
Quiet week in Phoenix, AZ (zone 9b). this week is a good time to step back and plan ahead.
Nothing critical on the calendar this week.
187 bars · 37 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 9b
Ranked by how many crops in your zone they affect. Click through for IPM controls and signs to watch for.
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.
Meloidogyne species
Microscopic soil-dwelling worm that forms galls on roots, reducing vigor and yield.
Tetranychus urticae
Tiny mite that feeds on leaf undersides, causing stippling and webbing during hot dry weather.
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.
Odocoileus species
Whitetail and mule deer browse can devastate orchards and gardens, particularly in winter when food is scarce. Antler rub on young trunks kills saplings outright.
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.
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.
Top diseases for zone 9b
Ranked by how many crops in your zone they affect. Click through for symptoms, controls, and resistant varieties.
Pseudoperonospora cubensis (cucurbits) and others
Water mold (oomycete, not a true fungus) that thrives in cool damp conditions. Spreads rapidly through cucurbit and brassica plantings on wind-borne spores.
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.
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.
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.
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.
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.
Tomato spotted wilt orthotospovirus (TSWV)
Virus vectored by thrips, particularly western flower thrips. Wide host range and growing global distribution. No cure once infected.
Companion planting suggestions
Beneficial pairings drawn from companion data, filtered to crops that grow in zone 9b.
- 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.
- Lettuce + Tomato
Lettuce planted at tomato's base benefits from afternoon shade as the tomato grows, extending the lettuce harvest into early summer. Different root depths avoid competition.
- Cabbage + Onion
Onion smell confuses cabbage moth. Both prefer similar moisture and fertility. The onion-cabbage interplanting is a Northern European tradition.
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
Invert the seasonal calendar. Treat October through April as the primary growing season and plan cool-season crop succession plantings for September, November, January, and March to maintain year-round supply. Midsummer is dormancy or shade-cloth season for annuals. For heat-tolerant perennials (figs, pomegranates, jujubes, Asian persimmons), position them to receive afternoon shade from structures or larger trees; they tolerate heat well but appreciate afternoon relief in the most intense months. Establish drip irrigation infrastructure before planting anything; hand watering in summer is impractical, and many crops fail not from heat but from inconsistent water availability when hand-watered during peak season.
Frequently asked questions
- What crops grow most reliably in Phoenix?
Heat-tolerant perennials succeed year-round: figs, pomegranates, jujubes, Asian persimmons, and goji berries. Cool-season annuals (lettuce, spinach, kale, brassicas, carrots, beets) are the main crops for October through April. Tomatoes and peppers can work if planted early (February to March) for spring harvest before peak heat, or very late (August to September) for a fall crop.
- When should I plant tomatoes in Phoenix?
Two planting windows work: early (February to March) for a spring harvest before midsummer heat arrives, or late (August to September) for a fall crop after summer dormancy. Avoid May and June plantings; midsummer conditions cause poor flowering and fruit set.
- What is the biggest weather risk in Phoenix gardening?
Heat stress during midsummer is far more damaging than winter frost. The zone 9b cold minimum rarely causes problems, but sustained midsummer heat causes crop failure and plant death. The secondary risk is the late January 6 frost date, which can catch tender new growth if spring plantings push too early.
- How do I protect plants from the late January frost?
Delay spring planting of tender perennials until after January 6, or refrain from pruning heavily until after that date so new growth is not exposed. Row covers or temporary shade cloth can protect emerged growth if a hard frost occurs in January.
- Do I need to water more often in Phoenix?
Summer water demand is intense. Drip irrigation on a timer is essential rather than optional; hand watering leads to crop failure due to inconsistency during peak heat. Most gardeners plan midsummer dormancy or heavy shade to reduce watering frequency.
- Should I grow vegetables in summer?
Most Phoenix gardeners treat summer as a rest season. Growing annuals in summer requires heavy shade, careful variety selection, and intensive watering. It is far simpler and less costly to garden intensively October through May and let the landscape rest midsummer.
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Frost data: NOAA Climate Normals 1991-2020, station USW00003192. Local microclimates can shift these dates by a week or more.
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