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

Planting zone for Middleburg, FL

Middleburg, FL is in USDA zone 9a across its 2 ZIP codes.

Middleburg 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.

Zone9a20 to 25 °F
ZIP codes2
Last frostrare
First frostrare
Growing seasonall year

9a 2 ZIPs

Frost forecast — next 7 nights

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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 Jacksonville NAS, FL, elevation 20 ft) the median growing season is 330 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 32068 came on Jan 17 — 6 days earlier than the 1991–2020 average (Jan 23).

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 9a in Florida

473 plants native to the lower 48 states, recorded in Florida, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. 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 113

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 143

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 Middleburg, FL.

Soil in Middleburg, FL

The soil mapped at the center of ZIP 32068 is Ousley — fine sand, somewhat poorly drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter0.25%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Ousley fine sand, occasionally flooded.

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 32068; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Middleburg, FL

Summer high92 °Faverage high, July
Winter low47 °Faverage low, January
Hot days96days a year at 90 °F or more
Freezing nights4nights a year at 32 °F or less
Growing degree days7,918base 50 °F — the season’s usable heat
Longest day14 h 05 mindaylight on June 21
Shortest day10 h 12 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation53.4 inper year, rain and melted snow

Average high and low, by month

40°50°60°70°80°90°100°January: average high 66 °F, low 47 °F 66°47° JanFebruary: average high 69 °F, low 50 °F 69°50° FebMarch: average high 74 °F, low 55 °F 74°55° MarApril: average high 81 °F, low 61 °F 81°61° AprMay: average high 86 °F, low 69 °F 86°69° MayJune: average high 90 °F, low 74 °F 90°74° JunJuly: average high 92 °F, low 76 °F 92°76° JulAugust: average high 91 °F, low 76 °F 91°76° AugSeptember: average high 88 °F, low 74 °F 88°74° SepOctober: average high 82 °F, low 66 °F 82°66° OctNovember: average high 73 °F, low 56 °F 73°56° NovDecember: average high 68 °F, low 50 °F 68°50° Dec

Precipitation by month inches

0″2″4″6″8″January: 3.49 in precipitation 3.5 JanFebruary: 2.78 in precipitation 2.8 FebMarch: 3.43 in precipitation 3.4 MarApril: 2.70 in precipitation 2.7 AprMay: 4.23 in precipitation 4.2 MayJune: 7.65 in precipitation 7.7 JunJuly: 6.45 in precipitation 6.5 JulAugust: 7.02 in precipitation 7.0 AugSeptember: 6.52 in precipitation 6.5 SepOctober: 4.23 in precipitation 4.2 OctNovember: 2.30 in precipitation 2.3 NovDecember: 2.55 in precipitation 2.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Jacksonville NAS, FL (17 mi away); precipitation: Orange Park 4.1 Wsw, FL (8 mi away). Daylight is calculated from latitude.

ZIP codes in Middleburg

320509a
20 to 25 °F
320689a
20 to 25 °F

Florida planting zones →

Questions about Middleburg

What planting zone is Middleburg, FL?

Middleburg, FL is in USDA hardiness zone 9a on the 2023 map (9a: 20 to 25 °F).

What kind of onions grow in Middleburg, FL?

Short-day onions: the longest day is 14 h 05 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

How much rain and snow does Middleburg, FL get?

About 53.4 inches of precipitation a year (NOAA 1991–2020 normals).