Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for Seffner, FL

Seffner, FL is in USDA zone 9b across its 2 ZIP codes.

Seffner on the zone map

Outlined: its 1 ZIP code areas · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone9b25 to 30 °F
ZIP codes2
Last frostrare
First frostrare
Growing seasonall year

9b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Seffner, FL…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Tampa Intl Airport, FL, elevation 20 ft) the median growing season is 365 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 33584 came on Jan 12 — 4 days earlier than the 1991–2020 average (Jan 16).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 9b in Florida

477 plants native to the lower 48 states, recorded in Florida, and rated by the USDA to survive 25 °F or colder — the bottom of zone 9b. Each links to its USDA PLANTS profile.

Trees 66

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °FAtlantic white cedar50 ft · blooms spring · medium shade tolerance · to −36 °F

Shrubs 114

aloe yucca15 ft · blooms early summer · medium shade tolerance · to −1 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °F

Wildflowers & perennials 146

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican century plant6 ft · blooms indeterminate · high shade tolerance · to 12 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 131

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fbig cordgrass8 ft · blooms spring · high shade tolerance · to −3 °F

Vines 12

American wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Seffner, FL.

Soil in Seffner, FL

The soil mapped at the center of ZIP 33584 is Lake — fine sand, excessively drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding
pH5.4strongly acidic; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter2.08%moderate
Hydrologic groupAwater soaks in fast
Farmland classFarmland of unique importanceUSDA classification

Map unit: Lake fine sand, 0 to 5 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 33584; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Seffner, FL

Summer high94 °Faverage high, July
Winter low50 °Faverage low, January
Hot days111days a year at 90 °F or more
Freezing nights3nights a year at 32 °F or less
Growing degree days8,907base 50 °F — the season’s usable heat
Longest day13 h 55 mindaylight on June 21
Shortest day10 h 22 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation56.7 inper year, rain and melted snow

Average high and low, by month

40°50°60°70°80°90°100°January: average high 75 °F, low 50 °F 75°50° JanFebruary: average high 78 °F, low 53 °F 78°53° FebMarch: average high 81 °F, low 56 °F 81°56° MarApril: average high 86 °F, low 61 °F 86°61° AprMay: average high 91 °F, low 67 °F 91°67° MayJune: average high 93 °F, low 72 °F 93°72° JunJuly: average high 94 °F, low 73 °F 94°73° JulAugust: average high 94 °F, low 74 °F 94°74° AugSeptember: average high 92 °F, low 72 °F 92°72° SepOctober: average high 87 °F, low 66 °F 87°66° OctNovember: average high 81 °F, low 58 °F 81°58° NovDecember: average high 77 °F, low 53 °F 77°53° Dec

Precipitation by month inches

0″2″4″6″8″10″January: 3.22 in precipitation 3.2 JanFebruary: 2.33 in precipitation 2.3 FebMarch: 2.76 in precipitation 2.8 MarApril: 2.82 in precipitation 2.8 AprMay: 3.58 in precipitation 3.6 MayJune: 8.55 in precipitation 8.6 JunJuly: 8.28 in precipitation 8.3 JulAugust: 10.61 in precipitation 10.6 AugSeptember: 7.20 in precipitation 7.2 SepOctober: 2.85 in precipitation 2.9 OctNovember: 1.91 in precipitation 1.9 NovDecember: 2.55 in precipitation 2.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Plant City, FL (9 mi away); precipitation: Plant City 6.5 Nw, FL (7 mi away). Daylight is calculated from latitude.

ZIP codes in Seffner

335839b
25 to 30 °F
335849b
25 to 30 °F

Florida planting zones →

Questions about Seffner

What planting zone is Seffner, FL?

Seffner, FL is in USDA hardiness zone 9b on the 2023 map (9b: 25 to 30 °F).

What kind of onions grow in Seffner, FL?

Short-day onions: the longest day is 13 h 55 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

How much rain and snow does Seffner, FL get?

About 56.7 inches of precipitation a year (NOAA 1991–2020 normals).