Local planting guide · Southwest
zip 85378
Surprise is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 01/08 through 12/25 (~354 days). This zip falls within the Southwest growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 01/08
- First fall frost
- 12/25
- Growing season
- 354 days
- Compatible crops
- 37
- Growing region
- Southwest
Right now in Surprise
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Surprise
Surprise's 354-day growing season is nearly year-round, with the last spring frost arriving January 8 and the first fall frost not until December 25. The real constraint here is not cold but heat and water. Summer temperatures regularly exceed 110°F, creating a climate where heat-loving Mediterranean fruits thrive. Figs, pomegranates, Asian persimmons, and jujubes produce abundantly with minimal supplemental care. Goji berries, though less common, adapt well to the climate. The challenge is navigating a bimodal growing calendar: winter (October through April) is the active season for cool-season crops and fruit tree establishment, while summer (May through September) becomes a holding pattern for anything frost-sensitive, requiring aggressive afternoon shade and deep mulching. Tomatoes and peppers flourish but need afternoon protection during peak heat. The dry air and intense sun create ideal conditions for Mediterranean and semi-arid crops while making cool-season vegetables viable only in the extended winter window.
Regional context · Southwest
What the Southwest brings to Surprise
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 Surprise
Extreme summer heat is the defining challenge. Peak afternoon temperatures above 110°F will sunburn peppers, wilt tomatoes despite irrigation, and cause fruit on young trees to drop. Late spring frost is a secondary but real risk; the January 8 average masks variability, and tender new growth on early-sprouted trees can be caught by occasional sub-freezing nights into early February. Low atmospheric humidity makes powdery mildew rare but increases water demand and can degrade fruit quality on heat-sensitive varieties. Water availability is structural: Surprise is in Arizona's semi-arid zone, and seasonal irrigation restrictions can disrupt the garden calendar. Alkaline soil, common to the Phoenix metro area, limits acid-loving crops without amendment. Cool-season crops bolt or struggle completely May through September, eliminating half the traditional growing calendar.
Crops that grow in Surprise
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 Surprise
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Surprise's local frost dates.
Week ? · loading
This week in Surprise, AZ (zone 9b)
Quiet week in Surprise, 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 Surprise
Winter is prime planting time. January through March is when fruit trees, cool-season vegetables, and perennials establish best, taking advantage of mild temperatures and occasional winter rainfall. Use this window aggressively for bare-root trees and starts. Succession plant cool-season crops starting in August for continuous harvest through March. Lettuce, brassicas, and root crops seeded every two weeks from August through October provide regular harvests before heat forces dormancy in April. Afternoon shade cloth or east-facing placement is non-negotiable for heat-sensitive crops May through September. Deploy shade by early May and remove by October. Pair shade with deep mulch (4 to 6 inches) and drip irrigation to buffer plants against sustained 110°F+ heat.
Frequently asked questions
- What fruit trees are most reliable in Surprise?
Figs, pomegranates, jujubes, and Asian persimmons thrive with minimal pest pressure and produce for decades. Citrus works but requires freeze protection on nights when temperatures drop below 28°F.
- When should I plant tomatoes and peppers in Surprise?
Start seedlings indoors in late January for transplanting in mid-February. They'll be established before peak summer heat arrives. Cool-season crops follow the opposite schedule: seed lettuce, spinach, and brassicas from August through early September.
- What's the single biggest weather risk in Surprise gardening?
Extreme summer heat exceeding 110°F, not frost. This heat dormancy eliminates most vegetables May through September. Plan the garden calendar around winter production and summer maintenance.
- Can I grow lettuce and cool-season vegetables year-round?
No. Heat forces dormancy May through September. Plant cool-season crops from August through October for harvests October through March, then resume sowings in late August.
- Do I need to protect young fruit trees from late frost?
Possibly. The January 8 average masks variability; occasional dips to the mid-20s occur into early February. Wrap trunks of newly planted tender trees or position them east-facing to delay bloom past frost risk.
- What irrigation strategy works for Surprise's dry climate?
Drip irrigation is essential. Surface watering evaporates in low humidity and heat. Mulch heavily (4 to 6 inches) to reduce frequency. Established fruit trees need deep soaking 1 to 2 times weekly in summer; adjust based on rainfall.
+−
+−
+−
+−
+−
+−
Frost data: NOAA Climate Normals 1991-2020, station USW00003184. Local microclimates can shift these dates by a week or more.
Related