Local planting guide · Great Plains
zip 77009
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's zone 9b offers a 330-day growing season with consistently mild winters (minimum around 25-30°F). The last spring frost arrives January 30, and the first fall frost doesn't come until December 28, enabling year-round gardening for well-adapted crops. The defining constraint is not cold but heat and humidity.
The spring window is deceptively narrow. Although frost risk ends in late January, tomatoes, peppers, and leafy greens planted then encounter high disease pressure as Houston's warm, humid spring arrives. Most vegetable gardeners adopt a dual-season rhythm: cool-season crops September through May, warm-season crops May through August.
Certain crops thrive here that struggle elsewhere in zone 9b. Figs, Asian persimmons, pomegranates, jujubes, and goji berries reliably produce in Houston's heat. Deciduous fruits requiring substantial winter chill (apples, pears) are marginal unless low-chill varieties are selected.
The extended growing season is a genuine advantage. Cool-season crops planted in September will mature well into fall before December frost.
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
Houston's humidity and warm temperatures create ideal conditions for fungal diseases, particularly on leafy greens and tomatoes in spring. Powdery mildew and early blight strike in April through June when conditions are warmest and dampest. Drainage is a perennial problem; many Houston soils are heavy clay, and summer storms deposit water faster than the ground can absorb it. Raised beds and soil amendment are nearly mandatory for consistent vegetable production.
The other constraint is late-spring heat waves. Tomatoes and peppers planted in January often fail to set fruit in May as temperatures spike above 90°F and humidity peaks. A late frost in February or March, while statistically rare, can still occur and devastates tender transplants. The safest approach is to delay transplanting until mid-to-late March, accepting a shorter window in exchange for lower disease and heat stress.
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, delay spring transplanting until mid-to-late March, even though the last frost date is January 30. Heat and humidity in May pose a greater risk to fruit set than frost risk. A cooler March-to-April window allows tomatoes and peppers longer to establish and set fruit before heat-induced blossom-end rot becomes widespread.
Second, embrace succession planting for cool-season crops. Plant leafy greens and brassicas every 2-to-3 weeks from September through November to stagger harvests and prevent disease pressure from building. Large plantings done at once become disease hotspots where fungal problems spread rapidly.
Third, amend heavy clay soil with compost and consider raised beds for vegetables. Houston's dense clay and wet springs demand good drainage. Containers and amended beds outperform in-ground planting for most vegetables, particularly those prone to root rot and fungal infection.
Frequently asked questions
- What are the easiest crops to grow in Houston?
Figs, Asian persimmons, pomegranates, jujubes, and goji berries thrive with minimal pest pressure. Among vegetables, sweet peppers and hot peppers tolerate heat well if planted after mid-March. Okra, yams, and southern peas like black-eyed peas and purple hulls are also regionally adapted.
- When should I plant tomatoes in Houston?
Mid-to-late March is optimal for transplants. January plantings often struggle in May when heat exceeds 90°F and fruit set declines. Early-season varieties (55-to-65 days) offer the best chance of harvest before summer heat reduces productivity.
- Is frost a real risk in Houston?
Late frost in February or March is statistically rare but possible. While the January 30 last frost date is sound on average, tender transplants like peppers and sweet potato slips are safer planted after mid-March to avoid damaging freeze events.
- What's the biggest weather challenge in Houston?
Summer humidity and fungal diseases are the primary concern, especially in spring (April through June) when tomatoes and leafy greens are vulnerable. Disease management through variety selection, proper spacing, and drip irrigation is more critical than frost protection.
- Can I grow apples or pears?
Low-chill varieties like Anna apple or Orient pear may work with trial, but Houston's lack of winter chill and high summer humidity make them marginal choices. Figs and Asian pears are better tree fruits for this region.
+−
+−
+−
+−
+−
Frost data: NOAA Climate Normals 1991-2020, station USW00012918. Local microclimates can shift these dates by a week or more.
Related