Local planting guide · California
zip 95376
Tracy is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 02/06 through 12/01 (~304 days). This zip falls within the California growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 02/06
- First fall frost
- 12/01
- Growing season
- 304 days
- Compatible crops
- 37
- Growing region
- California
Right now in Tracy
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Tracy
Tracy's defining advantage is a growing season spanning 10 months (February through December). The zone 9b designation means winter lows rarely drop below 25°F, creating a nearly frost-free winter for cold-hardy perennials. However, the last spring frost date of February 6 carries real weight. Late winter and early spring freezes are common enough that frost-tender crops (tomatoes, peppers, basil) planted too early suffer losses. The other side of the season is equally generous: the first fall frost doesn't arrive until December 1, permitting three full months of tomato and pepper harvest as summer heat subsides. The dominant constraint is not cold but heat. Central Valley summers routinely exceed 95°F and occasionally touch 105°F or higher. Heat-sensitive crops (leafy greens, cool-season brassicas) bolt or wilt by June. The best strategy treats Tracy like two seasons: extend cool-weather crops into winter, and front-load heat-loving crops (fruit trees, peppers, tomatoes) early to finish before peak August heat.
Regional context · California
What the California brings to Tracy
From cool foggy coast to hot Central Valley to mountain to desert. Mediterranean climate dominates: wet winters, dry summers. The most productive agricultural state in the country, with reach into citrus and olives that exceed the rest 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 Tracy
Late-winter frost is the most persistent issue. Despite the early February frost date, freeze events can occur into early March in surrounding areas. Tender perennials planted or pruned in late January sometimes suffer damage. Second, summer heat kills or stresses plants that would thrive in milder parts of zone 9b. Tomatoes stop setting fruit when daily highs exceed 95°F for sustained periods, creating a July-to-early-August fruit gap. Powdery mildew appears predictably on certain crops (grapes, stone fruits) when night temperatures cool in fall and morning humidity rises. Third, water availability during the dry season (May through September) requires consistent irrigation. Central Valley has historically low summer rainfall, and many home gardeners underestimate the frequency of watering needed to sustain fruit production through heat.
Crops that grow in Tracy
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 Tracy
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Tracy's local frost dates.
Week ? · loading
This week in Tracy, CA (zone 9b)
Quiet week in Tracy, CA (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 Tracy
Tender crops (tomatoes, peppers, basil) planted before mid-February face freeze risk through early March. Transplants set after February 15 benefit from warmer soil and increasing day length, establishing steadily without early-season stress. Early spring (February through April) is the ideal window for cool-season crops and for planting long-season fruit trees and perennials when temperatures remain moderate. Summer heat protection via shade cloth (30 to 40% density) in July and August prevents sun scald and extends the productive window. Even heat-adapted tomatoes and peppers maintain better fruit set and quality under partial shade during peak heat weeks.
Frequently asked questions
- What are the best crops to grow in Tracy?
Fruit trees dominate: figs, Asian persimmons, pomegranates, and jujubes thrive in the heat and long season. Tomatoes and peppers grow exceptionally well if planted after mid-February and harvested before August heat peaks. Cool-season crops (lettuce, brassicas, root vegetables) grow best in fall and winter months.
- When can I safely plant tomatoes and peppers?
Wait until mid-February to avoid late-winter frosts. Planting before February 15 risks losing seedlings to unexpected freezes. Transplants set after February 20 encounter warm enough soil and day length to grow steadily through spring without stress.
- What's the biggest weather risk for Tracy gardeners?
Late-winter freezes in February and early March are the primary threat. The February 6 frost date indicates frost protection is needed for tender crops through mid-March. Summer heat in July and August can cause tomato and pepper flower drop, reducing yield.
- Can I grow crops year-round in Tracy?
Nearly. The 304-day growing season (February to December) supports crops that would stall elsewhere. Cool-season crops occupy February through April and September through December. Heat-loving crops fill May through August. January is the only true dormant window.
- How do I manage summer heat stress?
Apply shade cloth (30 to 40% density) to heat-sensitive crops in July and August. Increase irrigation frequency to account for higher evaporation. Mulch around plants to keep roots cooler. Prioritize early planting so crops finish before peak August heat.
- Are frost-protective measures necessary in Tracy?
Yes, through mid-March. Frost cloth or temporary shelters protect tender perennials and newly planted trees from February and March freezes. Once stable 50°F+ temperatures arrive in mid-March, frost protection can be removed.
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Frost data: NOAA Climate Normals 1991-2020, station USW00023237. Local microclimates can shift these dates by a week or more.
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