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

Planting zone for 47283 — Westport, IN

ZIP code 47283 (Westport, Decatur County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 21 and the first fall frost October 21.

Where ZIP 47283 is

Outlined: the ZIP code area · 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 21
First frostOct 21
2012 zone6a

Was 6a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Westport, IN…

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 in Westport, IN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 21median — 50% chance of a later frost
Safe for tender plantsMay 10only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 7
Growing season180 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 8 and returns around October 31.

From the NOAA station N Vernon 2 Ese, IN — 12 miles away, elevation 745 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 47283

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 10 – Mar 24
SpinachSow outdoors · Mar 10 – Mar 31
Broccoli, cabbageStart indoors · Feb 10 – Feb 24
Broccoli, cabbageTransplant · Mar 31 – Apr 14
Onion setsPlant outdoors · Mar 24 – Apr 7
PotatoesPlant outdoors · Mar 31 – Apr 14
LettuceSow outdoors · Mar 24 – Apr 7
Carrots, beetsSow outdoors · Mar 31 – Apr 14
TomatoesStart indoors · Feb 24 – Mar 10
TomatoesTransplant · Apr 28 – May 12
Peppers, eggplantStart indoors · Feb 10 – Feb 24
Peppers, eggplantTransplant · May 5 – May 19
BeansSow outdoors · Apr 28 – May 12
Sweet cornSow outdoors · Apr 28 – May 12
Cucumbers, squashSow outdoors · Apr 28 – May 12
Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 21) and first fall frost (Oct 21) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 47283 came on Mar 10 — 12 days earlier than the 1991–2020 average (Mar 22).

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 6b in Indiana

564 plants native to the lower 48 states, recorded in Indiana, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 72

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 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 105

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 202

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °F

Grasses 162

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °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 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 11

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °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 °Fheartleaf peppervine2 ft · blooms late spring · low 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 Westport, IN.

Soil in Westport, IN

The soil mapped at the center of ZIP 47283 is Hickory — loam, well drained.

TextureLoama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.25%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Hickory loam, 18 to 25 percent slopes, eroded.

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 47283; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Westport, IN

Summer high86 °Faverage high, July
Winter low23 °Faverage low, January
Hot days19days a year at 90 °F or more
Freezing nights102nights a year at 32 °F or less
Growing degree days3,789base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation49.3 inper year, rain and melted snow
Snowfall17 inper year; 16 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 23 °F 40°23° JanFebruary: average high 45 °F, low 26 °F 45°26° FebMarch: average high 55 °F, low 34 °F 55°34° MarApril: average high 67 °F, low 44 °F 67°44° AprMay: average high 75 °F, low 53 °F 75°53° MayJune: average high 83 °F, low 61 °F 83°61° JunJuly: average high 86 °F, low 65 °F 86°65° JulAugust: average high 85 °F, low 63 °F 85°63° AugSeptember: average high 79 °F, low 56 °F 79°56° SepOctober: average high 68 °F, low 45 °F 68°45° OctNovember: average high 55 °F, low 35 °F 55°35° NovDecember: average high 44 °F, low 28 °F 44°28° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.37 in precipitation, 4.8 in snowfall 3.4❄5 JanFebruary: 3.16 in precipitation, 5.9 in snowfall 3.2❄6 FebMarch: 4.22 in precipitation, 2.2 in snowfall 4.2❄2 MarApril: 5.28 in precipitation, 0.1 in snowfall 5.3 AprMay: 4.92 in precipitation 4.9 MayJune: 5.07 in precipitation 5.1 JunJuly: 4.47 in precipitation 4.5 JulAugust: 4.45 in precipitation 4.5 AugSeptember: 3.34 in precipitation 3.3 SepOctober: 3.53 in precipitation 3.5 OctNovember: 3.83 in precipitation, 0.3 in snowfall 3.8 NovDecember: 3.66 in precipitation, 3.9 in snowfall 3.7❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: N Vernon 2 Ese, IN (12 mi away); precipitation: N Vernon 2 Ese, IN (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

472446b
Hartsville, IN · 7 mi
472366b
Grammer, IN · 7 mi
472236b
Butlerville, IN · 10 mi
472736b
Scipio, IN · 10 mi
472406b
Greensburg, IN · 11 mi
472656b
North Vernon, IN · 11 mi
472326b
Elizabethtown, IN · 12 mi
472826b
Vernon, IN · 13 mi

Indiana planting zones →

Questions about 47283

What planting zone is ZIP code 47283?

ZIP code 47283 (Westport, IN) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Westport, IN?

The median last spring frost (32 °F) near 47283 is April 21; after May 10 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, N Vernon 2 Ese station.

When is the first frost in Westport, IN?

The median first fall frost near 47283 is October 21, giving a median frost-free growing season of 180 days.

When should I plant tomatoes in 47283?

Start tomato seeds indoors around Feb 24 – Mar 10 and set transplants outside around Apr 28 – May 12, one to three weeks after the median last frost.

How much rain and snow does 47283 get?

About 49.3 inches of precipitation a year and 17 inches of snowfall (NOAA 1991–2020 normals, N Vernon 2 Ese station).

How hot do summers get in Westport, IN?

The average high peaks at 86 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 47283 have?

The USDA soil survey maps Hickory at the center of ZIP 47283: loam, well drained, pH about 5.9 (moderately acidic).

Did spring come early in Westport, IN in 2026?

Spring leaf-out near 47283 came on Mar 10 in 2026, 12 days earlier than the 1991–2020 average (Mar 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Westport, IN?

Intermediate onions: the longest day near 47283 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 47283 change?

Yes. The 2012 USDA map put 47283 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.