Local planting guide · Great Plains
zip 77209
Houston is in USDA hardiness zone 9b, with average winter lows of 25°F to 30°F. The local growing season runs roughly 01/30 through 12/28 (~330 days). This zip falls within the Great Plains growing region.
- USDA zone
- 9b 25°F to 30°F
- Last spring frost
- 01/30
- First fall frost
- 12/28
- Growing season
- 330 days
- Compatible crops
- 37
- Growing region
- Great Plains
Right now in Houston
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Houston
Houston gardeners operate in a remarkable window: a 330-day growing season framed by a mild last spring frost on January 30 and an exceptionally late first fall frost on December 28. This extension transforms the region into a zone 9b hot spot where traditional cold-season barriers barely apply. The constraint here is not frost, but rather the opposite: intense summer heat and the humidity that accompanies it. The winter chill hours are marginal (zone 9b extremes reach only 25 to 30°F), which narrows the stone-fruit palette considerably but opens the door to heat-adapted crops like figs, Asian persimmons, pomegranates, and jujubes that struggle in colder zones. Crops thrive in spring and fall, while summer presents a distinct challenge: the peak heat and humidity of June through August can stress tender vegetables and trigger fungal pressure. Understanding this rhythm, long but hot, is essential to matching variety selection and planting timing to local conditions.
Regional context · Great Plains
What the Great Plains brings to Houston
Continental, windy, with severe heat and cold extremes. Cold-hardy fruit and small grains north; long warm season for melons, peppers, and pecans south.
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 Houston
Late spring frosts remain a significant risk through January and into early February, catching early bloomers like peaches and tender new growth on figs before the last frost date on January 30. Meanwhile, the opposite problem dominates summer: intense heat and humidity conspire to reduce fruit set on tomatoes and peppers, promote fungal diseases on foliage and stems, and trigger stress responses in moisture-sensitive crops. The third challenge is the clay soil prevalent in the Houston area, which compacts easily, sheds water after heavy rain, and creates alternating cycles of waterlogged conditions and hard-packed drought stress. Disease pressure from fungal pathogens escalates steadily from May onward and remains elevated through fall; powdery mildew, rust, and various blights thrive in the warm, humid air.
Crops that grow in Houston
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 Houston
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Houston's local frost dates.
Week ? · loading
This week in Houston, TX (zone 9b)
Quiet week in Houston, TX (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 Houston
First, exploit the extended fall season by seeding cool-season crops (brassicas, leafy greens, root vegetables) from mid-August through early October, giving them a full six weeks of mild conditions and ample light before frost arrives on December 28. This is when the Houston garden genuinely excels and produces high-quality crops. Second, delay frost-sensitive plantings until after January 30, the documented last spring frost date, to avoid costly losses on tender perennials, figs, and tropical fruits. Third, for summer crops like tomatoes and peppers, choose heat-tolerant varieties and plan for afternoon shade or selective pruning to reduce heat stress and sunscald on developing fruit. Drip irrigation and mulch buffer against the rapid drying of clay soil in peak summer heat and help maintain consistent soil moisture.
Frequently asked questions
- What are the best fruit trees to grow in Houston?
Figs, Asian persimmons, pomegranates, and jujubes excel in zone 9b heat and humidity. Citrus also thrives if planted in raised beds to avoid clay-soil issues. Avoid high-chill-hour varieties of apples and stone fruits, which struggle with insufficient winter cold.
- When should I plant tomatoes in the Houston area?
Wait until after the last spring frost on January 30, then target late February to early March for main-season plantings. This window gives transplants a six-week buffer before summer heat arrives. Heat-sensitive varieties should be harvested before peak July heat triggers blossom-end rot.
- What is the biggest weather threat to my garden in Houston?
Summer heat and humidity. Peak temperatures stress tomatoes, peppers, and tender squash, reducing fruit set and promoting disease. A late spring frost (possible through January) can damage early-season bloomers, particularly figs and peaches.
- How do I manage the humidity and fungal disease pressure?
Space plants for airflow, water at soil level (not foliage), and remove lower leaves to improve circulation. Drip irrigation is essential in Houston's humidity. Choose disease-resistant varieties where available, especially for tomatoes and peppers. Fungal pressure peaks from May through October.
- Why is clay soil a problem in Houston?
Clay compacts easily, sheds water after rain, and becomes waterlogged or hard-packed depending on moisture. Raised beds or soil amendment with compost improve drainage and root penetration. Avoid working clay soil when wet.
- Can I grow heat-loving crops year-round in Houston?
Summer is challenging for heat-sensitive crops like tomatoes due to blossom-end rot and reduced set. Fall is the standout season: plant cool-season crops from mid-August onward to exploit the 330-day growing season and mild first fall frost on December 28.
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Frost data: NOAA Climate Normals 1991-2020, station USW00012918. Local microclimates can shift these dates by a week or more.
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