Local planting guide · Southeast
zip 33730
Saint Petersburg is in USDA hardiness zone 10b, with average winter lows of 35°F to 40°F. The local growing season runs roughly 01/17 through 01/14 (~365 days). This zip falls within the Southeast growing region.
- USDA zone
- 10b 35°F to 40°F
- Last spring frost
- 01/17
- First fall frost
- 01/14
- Growing season
- 365 days
- Compatible crops
- 23
- Growing region
- Southeast
Right now in Saint Petersburg
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Saint Petersburg
Saint Petersburg experiences year-round growing, with frost risk concentrated in mid-January. Winter low temperatures reach 35 to 40 degrees Fahrenheit around January 17 (the last likely spring frost), leaving most of the year frost-free. This climatic reality means the primary season is not limited by cold but by heat and humidity, a reversal of the constraints faced by gardeners in cooler regions.
Warm-season crops like tomatoes, peppers, eggplants, and sweet potatoes thrive without winter dormancy interruption. Figs fruit prolifically without chilling requirements, and tropical herbs like basil and rosemary produce continuously. However, intense summer heat and humidity from June through August present challenges that cooler-zone gardeners never encounter. Blossom-end rot becomes common in tomatoes during hot, dry spells; spider mites and scale insects proliferate; fungal diseases accelerate. Sandy soil, while common near the coast, drains quickly and demands consistent irrigation during dry periods.
Success here depends on heat-tolerant varieties, strategic shade use, and succession planting rather than the single-spring-plant-fall-harvest rhythm of cooler regions. The year-round growing window is genuine, but managing heat and humidity requires different techniques than managing frost.
Regional context · Southeast
What the Southeast brings to Saint Petersburg
Hot, humid, long growing season. Disease-resistant variety selection is the difference between a productive and a failed planting. Strong region for muscadines, blueberries, peaches, persimmons, figs, and warm-season vegetables.
Common challenges
Issues that most often defeat home gardeners in zone 10b, drawn from the broader USDA zone profile.
- ▸ No winter chill
- ▸ Tropical pest and disease pressure
- ▸ Saltwater intrusion in coastal soils
What defeats new gardeners in Saint Petersburg
The January frost window, though brief, poses the single greatest threat to perennial plantings. Tender plants like fig trees, established rosemary, and sweet potato plantings can suffer significant dieback if temperatures drop below their tolerance. Cold snaps outside the typical January 17 window are rare but do occur, catching gardeners off guard.
Summer heat and humidity create a distinct set of problems. Tomato blossom-end rot becomes common in August and September when soil calcium uptake becomes erratic during hot, dry stretches. Powdery mildew and spider mites thrive in the humid heat, especially on susceptible herbs and vegetables. The extended growing season means pests have continuous generations, and insect pressure from whiteflies and scale insects intensifies through summer and early autumn.
Crops that grow in Saint Petersburg
23 crops from our catalog match zone 10b, grouped by type.
Tree fruit
12 crops
zone 10b Fig
Ficus carica
zones 7a–10b
zone 10b Lemon
Citrus limon
zones 9a–11b
zone 10b Orange
Citrus sinensis
zones 9a–11b
zone 10b Lime
Citrus aurantiifolia
zones 9b–11b
zone 10b Grapefruit
Citrus paradisi
zones 9a–11b
zone 10b Mango
Mangifera indica
zones 10b–13b
zone 10b Avocado
Persea americana
zones 9b–11b
zone 10b Banana
Musa acuminata
zones 9b–13b
Berries
2 crops
Nuts
1 crop
Vegetables
6 crops
zone 10b Tomato
Solanum lycopersicum
zones 3a–10b
zone 10b Sweet Pepper
Capsicum annuum
zones 4a–10b
zone 10b Hot Pepper
Capsicum species
zones 4a–10b
zone 10b Eggplant
Solanum melongena
zones 5a–10b
zone 10b Sweet Potato
Ipomoea batatas
zones 6a–10b
zone 10b Okra
Abelmoschus esculentus
zones 6a–10b
Herbs
2 crops
Plan the year
Planting calendar for Saint Petersburg
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Saint Petersburg's local frost dates.
Week ? · loading
This week in Saint Petersburg, FL (zone 10b)
Quiet week in Saint Petersburg, FL (zone 10b). this week is a good time to step back and plan ahead.
Nothing critical on the calendar this week.
128 bars · 23 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 10b
Ranked by how many crops in your zone they affect. Click through for IPM controls and signs to watch for.
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.
Ceratitis capitata
Quarantine pest in many regions. Adult females puncture ripening fruit to lay eggs; larvae tunnel through the flesh, causing premature drop and rot.
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.
Meloidogyne species
Microscopic soil-dwelling worm that forms galls on roots, reducing vigor and yield.
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.
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.
Anastrepha suspensa
Tropical fruit fly endemic to Florida and the Caribbean. Less aggressive on commercial citrus than Mediterranean fruit fly, but devastating on guava, carambola, and other thin-skinned tropicals.
Top diseases for zone 10b
Ranked by how many crops in your zone they affect. Click through for symptoms, controls, and resistant varieties.
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.
Colletotrichum gloeosporioides
Most damaging mango disease worldwide. Fungal spores infect blossoms and developing fruit during humid weather, producing black sunken lesions that expand on ripening fruit.
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.
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.
Verticillium dahliae
Soil-borne fungal disease similar to fusarium wilt but with broader host range and cooler temperature optimum. Persists in soil for 10+ years.
Candidatus Liberibacter asiaticus
Devastating bacterial disease vectored by the Asian citrus psyllid. Once infected, trees decline progressively over several years and there is no cure. Has destroyed commercial citrus across Florida and threatens production worldwide.
Xanthomonas citri
Bacterial disease producing raised corky lesions on leaves, twigs, and fruit. Spread by wind-driven rain and contaminated tools. Quarantine-regulated in many areas.
Xanthomonas euvesicatoria and X. perforans
Bacterial disease causing leaf spots and fruit blemishes on pepper and tomato. Severe in warm humid weather, transmitted via splashing water and seed.
Companion planting suggestions
Beneficial pairings drawn from companion data, filtered to crops that grow in zone 10b.
- 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.
- Okra + Hot Pepper
Both heat-loving warm-season crops with similar water and fertility needs. Hot pepper at okra's base benefits from the slight afternoon shade in extreme summer heat.
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 Saint Petersburg
Hold off on heat-sensitive transplants until after January 17, but capitalize on the long window by planting succession crops in spring and again in late summer. Tomatoes planted in late July fruit abundantly in the mild autumn months.
Use shade cloth over beds from June through August to reduce surface soil temperature and slow water loss. Even heat-loving peppers perform better with afternoon shade during peak summer heat.
Invest in consistent irrigation for sandy soils. Summer droughts stress plants and trigger blossom disorders; winter dry spells (less common but possible) can stress perennial herbs and fig trees. Drip irrigation on a timer solves both problems.
Frequently asked questions
- What crops grow best year-round in Saint Petersburg?
Warm-season vegetables like tomatoes, peppers, eggplants, and sweet potatoes grow nearly continuously. Figs and other tropical fruits require no chilling. Herbs like basil and rosemary produce year-round. The limiting factor is summer heat; even heat-loving crops appreciate afternoon shade from June through August.
- When should I plant tomatoes?
Spring tomatoes (late January through February) fruit by May. For autumn harvest, plant a succession crop in late July or August; these fruit abundantly from October through December when temperatures cool. Both windows avoid the intense summer heat (June-August) that causes blossom-end rot and reduces fruit set.
- Is frost a real concern in zone 10b Saint Petersburg?
Yes, but narrowly. Mid-January frost risk (around January 17) is the only significant winter threat. Outside that window, freezes are rare. Tender perennials like figs and rosemary may suffer dieback, but recovery in spring is typical. Tender annuals planted after January 17 rarely encounter frost.
- How do I prevent blossom-end rot in summer tomatoes?
Blossom-end rot is a calcium-uptake disorder triggered by inconsistent soil moisture during hot, dry spells. Use drip irrigation on a timer to maintain even moisture. Mulch heavily to reduce evaporation. Plant succession crops in late July or August to avoid the most intense summer heat.
- What's the best succession planting strategy here?
Spring plantings (late January through April) thrive, then decline in summer heat. Skip mid-summer for heat-sensitive crops or use shade cloth. Late-summer plantings (late July onward) avoid peak heat and produce prolifically in autumn. This three-season rhythm maximizes year-round harvests.
- Can I really garden outside in January?
Yes. January is the transition month to spring growing season. Winter lows of 35-40°F occur around January 17, but frost risk is narrow. Cool-season crops thrive, and warm-season spring plantings can begin after January 24. It represents the optimal planting window for early spring crops.
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Frost data: NOAA Climate Normals 1991-2020, station USW00012873. Local microclimates can shift these dates by a week or more.
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