Local planting guide · Southwest
zip 85061
Phoenix is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 01/05 through 01/03 (~365 days). This zip falls within the Southwest growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 01/05
- First fall frost
- 01/03
- Growing season
- 365 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 (zone 9b) gardening operates on an inverted schedule compared to northern zones. The 365-day growing season is the most significant advantage, but frost risk concentrates near early January (around January 5 through January 3 of the following year), leaving most of the calendar year frost-free. Winter is the mild and most productive season (December-April), while summer heat consistently exceeding 100°F from June through September becomes the true limiting constraint. In Phoenix, crops thrive or fail based on heat tolerance rather than cold hardiness. Fig, Asian persimmon, pomegranate, jujube, and goji berry excel here because their natural growth cycle aligns with mild months and dormancy spans the scorching summer. Tomatoes and sweet peppers can be grown in two distinct windows: spring plantings produce early summer harvests (though with heat stress), and late-summer plantings (August-September) yield more robust fall-into-winter harvests. The late-summer planting window often produces more reliably than spring because plants mature during mild conditions and avoid heat stress during critical fruiting and fruit-setting stages.
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
Phoenix gardeners face two primary obstacles. Summer heat above 100°F (June-September) limits traditional crop choices unless shade cloth or heat-tolerant varieties are employed; many gardeners simply abandon outdoor vegetable gardening for four months. The second challenge is occasional hard freezes despite the mild zone 9b average (25-30°F lows). Freezes typically arrive in January or early February and occur roughly once per 5-10 years, but they can devastate tender growth on citrus, avocado, and newly sprouted fruit trees. A third, often-overlooked issue is soil: Phoenix's alkaline caliche layer (calcium carbonate subsoil) restricts root depth unless broken or amended. Shallow-rooted annual vegetables tolerate this, but deep-rooted fruit trees and perennial crops require either raised beds or physical caliche penetration to thrive.
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
- Plant vegetables and tomatoes on the fall-into-winter schedule: August and September plantings yield the most reliable harvests because plants mature during mild months (November-March) and avoid the brutal June-August heat spike. Spring plantings (February-March) work but require heat-tolerant varieties and shade cloth by June to prevent fruit damage. 2. Prioritize heat-loving perennial crops: Fig, pomegranate, jujube, and goji berry tolerate both occasional 25-30°F freezes and the extreme summer heat. They're far more productive per gallon of water than temperate-zone fruits and align naturally with Phoenix's climate rhythm. 3. Use August-September for heat-lovers that spring gardeners ignore: Okra, eggplant, yard-long beans, and Armenian cucumber thrive when temperatures exceed 100°F. While other gardeners' spring crops are wilting, these plants reach peak production.
Frequently asked questions
- What's the best time to plant tomatoes in Phoenix?
August-September planting yields reliable harvests (November-March) that avoid heat stress. Spring planting (February-March) works but requires heat-tolerant varieties and shade cloth from June onward. Most Phoenix gardeners find fall planting far more forgiving.
- Can I grow pomegranates and figs in Phoenix?
Yes, enthusiastically. Both thrive in zone 9b's heat and occasional 25-30°F freezes. Pomegranate and fig produce reliably with minimal water demands compared to temperate fruits and are among the most productive crops for this climate.
- When should I protect plants from frost?
Frost risk concentrates in early January (around January 5, when spring growth begins), with occasional hard freezes arriving through early February. Monitor winter forecasts; most years require minimal frost protection, but hard-freeze events do occur roughly once per decade and can damage citrus, avocado, and tender new growth.
- What grows reliably during Phoenix's scorching summers?
Okra, eggplant, yard-long beans, Armenian cucumber, and heat-tolerant pepper varieties thrive when temperatures exceed 100°F (June-September). Many gardeners abandon the garden in summer, but these crops reach peak production during Phoenix's hottest months. Jujube and goji berry also produce heavily in summer heat.
- Does Phoenix's soil need amendment for fruit trees?
Yes. The alkaline caliche layer (calcium carbonate subsoil) restricts root depth to 12-18 inches unless broken. Raised beds or physical caliche penetration with a jackhammer or auger is often necessary for fruit trees. Annual vegetables tolerate shallower rooting, but deep-rooted perennials require amendment.
- Why do my spring vegetable plantings fail so often?
Phoenix's spring planting timing works in temperate zones but fails here because plants must fruit during June-August heat extremes. Switch to August-September planting instead; plants mature during mild months (November-March) and avoid the heat-stress period entirely. This counter-intuitive shift dramatically improves success.
+−
+−
+−
+−
+−
+−
Frost data: NOAA Climate Normals 1991-2020, station USW00023183. Local microclimates can shift these dates by a week or more.
Related