Local planting guide · California
zip 94550
Livermore is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 02/27 through 12/01 (~278 days). This zip falls within the California growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 02/27
- First fall frost
- 12/01
- Growing season
- 278 days
- Compatible crops
- 37
- Growing region
- California
Right now in Livermore
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Livermore
Livermore has a 278-day growing season running from late February through early December. This extended season, combined with zone 9b's mild winters (minimum temperatures around 25 to 30°F), creates nearly ideal conditions for Mediterranean and warm-climate crops. The signature crops here are those that thrive in heat and drought: figs, pomegranates, Asian persimmons, and jujubes produce abundantly with minimal intervention. Tomatoes and peppers (both sweet and hot varieties) also flourish with proper variety selection to handle the intense summer heat. The later spring frost date (February 27) shapes spring planting strategy; tender crops need to wait until mid to late March to avoid frost damage to young growth. The tradeoff is a compensating benefit: the long fall window means harvests extend well into November and even December for cold-tolerant crops. The dominant constraint is summer water availability rather than cold. Livermore's location in the Coast Range foothills gives it slightly cooler summers than the inland valley, but irrigation management is still essential for sustained production.
Regional context · California
What the California brings to Livermore
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 Livermore
The late spring frost (February 27) can surprise growers who plant too early. Tomato transplants set out in February often encounter frost events that kill tender new growth, setting plants back by weeks. The second challenge is summer heat coupled with water restrictions. Without consistent irrigation during July and August, peppers drop flowers, tomato vines wilt, and even drought-tolerant figs show stress. A third issue, especially for valley-edge gardens, is powdery mildew on grapes, squashes, and other susceptible crops in the warm, dry months. Deer and ground squirrels are persistent problems in foothill areas, particularly in spring when young plants emerge and in fall when fruit ripens.
Crops that grow in Livermore
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 Livermore
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Livermore's local frost dates.
Week ? · loading
This week in Livermore, CA (zone 9b)
Quiet week in Livermore, 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 Livermore
First, select tomato and pepper varieties explicitly rated for heat tolerance and low bolting. 'Phoenix', 'Surefire', and similar varieties are bred for Central Valley conditions. Second, delay transplanting until late March or early April, well after the February 27 frost date, to avoid frost damage to young growth. Third, install drip irrigation or apply 3 to 4 inches of mulch (compost or wood chips) in May, before the hottest months, to regulate soil moisture and temperature. Deep, infrequent irrigation during dry spells develops stronger root systems than frequent shallow watering.
Frequently asked questions
- What are the best crops to grow in Livermore?
Livermore excels with Mediterranean and heat-loving crops: figs, pomegranates, Asian persimmons, and jujubes require minimal maintenance once established. For annuals, tomatoes and peppers thrive with proper variety selection. Cool-season crops (lettuce, brassicas, peas) grow well in fall and winter (October to March) but struggle in summer heat.
- When is the best time to plant tomatoes in Livermore?
Wait until mid to late March. The February 27 average last spring frost date means tender transplants set out earlier risk frost damage. Starting seeds indoors in January allows transplants to reach size by late March planting time, hitting the ground when soil is reliably warm.
- How does the February frost date affect planting in Livermore?
The February 27 frost date extends spring planning into late March for tender crops (tomatoes, peppers, basil, squash). But it also means the growing season is unusually long: the December 1 first fall frost allows harvests to continue through November. The net benefit is a 278-day season, longer than most of California.
- What's the biggest weather risk in Livermore?
Summer heat combined with water scarcity. Consistent irrigation July to September is non-negotiable for sustained pepper and tomato production. Powdery mildew also pressures grapes and squashes in warm, dry months; choose resistant varieties or plan for sulfur dusting if needed.
- Can deciduous fruit trees grow well in Livermore?
Yes. Apples, pears, peaches, and plums thrive in zone 9b, though variety selection for chill-hour requirements matters. Figs and pomegranates require essentially no winter cold and produce prolifically. The mild winters mean deciduous trees can spend most of the year actively growing.
+−
+−
+−
+−
+−
Frost data: NOAA Climate Normals 1991-2020, station USW00023285. Local microclimates can shift these dates by a week or more.
Related