Local planting guide · Southwest
zip 85041
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 gardening is defined by two constraints: year-round warmth and extreme summer heat. While most of the U.S. worries about spring and fall frosts, Phoenix's last spring frost (January 5) and first fall frost (January 3) mean the danger window is winter, not the shoulder seasons. This inverted frost calendar opens opportunity: the traditional U.S. growing season (spring through fall) is dominated by 110°F+ heat that kills or stresses most temperate crops.
Successful Phoenix gardening requires reframing around the desert calendar. The cool season (November through March) is when most tender crops thrive and frost protection is most relevant. Fig, pomegranate, and Asian persimmon are staples because they tolerate both winter frost and intense summer heat. Tomatoes, peppers, and eggplant can push into fall and early winter when temperatures moderate, extending harvest into months when the rest of zone 10a is slowing down.
Water is the second constraint. Phoenix's 365-day growing season assumes access to irrigation; rain-fed gardening is unreliable. Drought-adapted crops (figs, pomegranates, goji berries) reward deeper investment in established planting areas.
The upside is dramatic: two growing seasons in one calendar year. Cool-season crops (lettuce, brassicas, root crops) flourish October to April. Heat-loving crops take July to September. This calendar flexibility is rare in U.S. gardening.
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
Phoenix gardeners face three recurring obstacles:
Heat damage to spring-planted crops. Tomatoes and peppers planted in early spring run into 100°F+ heat by May, causing flower drop and reduced fruit set. Variety selection is critical; heat-tolerant cultivars are more forgiving than tender indeterminate types.
Winter frost on tender perennials. Figs and pomegranates are hardy to 10a, but the January frost dates can catch new growth if plants break dormancy early during a warm spell. Young trees and recently planted specimens need frost cloth protection in December and January.
Soil alkalinity. Phoenix's caliche-laden, alkaline soils complicate growing acid-loving plants like blueberries. Sulfur amendments work but slowly; many gardeners abandon these crops and focus on alkaline-tolerant alternatives instead.
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
Shift tomato and pepper timing. Plant transplants in late August or early September for a fall and winter harvest that avoids peak summer heat. This reversal contradicts standard U.S. advice but captures Phoenix's actual growth window for these crops.
Use the cool season for cool-season crops. October to March is peak productivity for lettuce, spinach, chard, broccoli, and cauliflower. Start seeds in September, harvest through April. This inverts the U.S. summer-vegetable calendar but matches Phoenix's climate.
Mulch perennials before January. The late-season frost dates (around January 5) come after a potentially warm December. Mulch figs, pomegranates, and other tender shrubs in late November, before a cold snap triggers new growth. This buffers against frost damage on new shoots.
Frequently asked questions
- What's the best crop to start with in Phoenix?
Figs and pomegranates are nearly foolproof; both tolerate Phoenix's winter frost and summer heat. Asian persimmons require less water than many temperate crops. For vegetables, peppers are more heat-tolerant than tomatoes if you accept summer dormancy.
- When do I plant tomatoes in Phoenix?
Late August to early September for a fall and winter harvest. Spring-planted tomatoes hit 110°F+ heat by late May, causing blossom drop. The inverse calendar takes adjustment but delivers ripe fruit when tomato crops elsewhere are failing.
- What's the single biggest frost risk in Phoenix?
Late-season frost in early January (around the 3rd to 5th) can damage new growth triggered by warm December weather. Figs and pomegranates are especially vulnerable. Watch the forecast and keep frost cloth handy through early January.
- Can I grow blueberries in Phoenix?
Blueberries need acidic soil; Phoenix's natural pH runs 7.8 to 8.2. Sulfur amendments help but take years. Most Phoenix gardeners skip blueberries and grow pomegranates, figs, or Asian persimmons instead.
- Is the 365-day growing season real, or marketing?
It's real but requires irrigation and careful variety selection. The cool season (October to April) and heat-loving season (roughly July to September) don't overlap for most crops. You're running two separate growing calendars, not gardening year-round on the same plant.
- Why does my fig tree stay dormant all summer?
In Phoenix, that's normal. Figs drop leaves and slow during the hottest months (June to August), conserving water. They resume growth in fall and fruit in winter. It looks like stress but it's adaptation to the desert environment.
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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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