Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 33779 — Largo, FL

ZIP code 33779 (Largo, Pinellas County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 33779 is

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.

Zone10a30 to 35 °F

Coldest night−1.1 to 1.7 °C

Last frostrare

First frostrare

2012 zone10a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 10a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Largo, 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 St Petersburg Intl Airport, FL — 7 miles away, elevation 10 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 33779 came on Jan 11 — 4 days earlier than the 1991–2020 average (Jan 15).

average
Jan 152026
Jan 11

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 10a in Florida

480 plants native to the lower 48 states, recorded in Florida, and rated by the USDA to survive 30 °F or colder — the bottom of zone 10a. Each links to its USDA PLANTS profile.

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 Largo, FL.

Soil in Largo, FL

The soil mapped at the center of ZIP 33779 is Immokalee — fine sand, poorly drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding

pH4.8strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter1.5%low — add compost

Hydrologic groupA/Ddrains fast once dried out; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Immokalee soils and Urban land.

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 33779; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Largo, FL

Summer high91 °Faverage high, August

Winter low53 °Faverage low, January

Hot days94days a year at 90 °F or more

Freezing nights0nights a year at 32 °F or less

Growing degree days8,745base 50 °F — the season’s usable heat

Longest day13 h 54 mindaylight on June 21

Shortest day10 h 23 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation53.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: St Petersburg Intl Airport, FL (7 mi away); precipitation: St. Petersburg 5.1 Nw, FL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

5 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

Saint Petersburg, FL · 2 mi

3370910b

Saint Petersburg, FL · 3 mi

All 6 ZIP codes in Largo → · Florida planting zones →

Questions about 33779

What planting zone is ZIP code 33779?

ZIP code 33779 (Largo, FL) is in USDA hardiness zone 10a on the 2023 map: the coldest night of an average winter reaches 30 to 35 °F (−1.1 to 1.7 °C).

How much rain and snow does 33779 get?

About 53.9 inches of precipitation a year (NOAA 1991–2020 normals, St. Petersburg 5.1 Nw station).

How hot do summers get in Largo, FL?

The average high peaks at 91 °F in August, with about 94 days a year at 90 °F or more.

What kind of soil does 33779 have?

The USDA soil survey maps Immokalee at the center of ZIP 33779: fine sand, poorly drained, pH about 4.8 (strongly acidic).

Did spring come early in Largo, FL in 2026?

Spring leaf-out near 33779 came on Jan 11 in 2026, 4 days earlier than the 1991–2020 average (Jan 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Largo, FL?

Short-day onions: the longest day near 33779 is 13 h 54 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.