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

Planting zone for 40051 — New Haven, KY

ZIP code 40051 (New Haven, Nelson County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 16 and the first fall frost October 25.

Where ZIP 40051 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 16
First frostOct 25
2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for New Haven, KY…

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 New Haven, KY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 3only 10% chance of frost after
First fall frostOctober 25median — 10% chance by Oct 11
Growing season191 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 3.

From the NOAA station Hodgenville Lincoln P, KY — 12 miles away, elevation 787 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 40051

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13
GarlicPlant cloves · Oct 11 – Nov 15
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 25) 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 40051 came on Mar 2 — 6 days earlier than the 1991–2020 average (Mar 8).

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 7a in Kentucky

547 plants native to the lower 48 states, recorded in Kentucky, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 78

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 109

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 181

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °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 speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 153

autumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblister sedge3 ft · blooms late spring · medium shade tolerance · to −38 °Fbluejoint5 ft · blooms late spring · high shade tolerance · to −33 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican 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 °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 New Haven, KY.

Soil in New Haven, KY

The soil mapped at the center of ZIP 40051 is Trappist — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Trappist silt loam, 12 to 20 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 40051; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in New Haven, KY

Summer high86 °Faverage high, July
Winter low25 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights93nights a year at 32 °F or less
Growing degree days4,085base 50 °F — the season’s usable heat
Longest day14 h 46 mindaylight on June 21
Shortest day9 h 33 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation52.1 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 44 °F, low 25 °F 44°25° JanFebruary: average high 50 °F, low 29 °F 50°29° FebMarch: average high 59 °F, low 35 °F 59°35° MarApril: average high 70 °F, low 44 °F 70°44° AprMay: average high 76 °F, low 54 °F 76°54° MayJune: average high 84 °F, low 62 °F 84°62° JunJuly: average high 86 °F, low 66 °F 86°66° JulAugust: average high 86 °F, low 64 °F 86°64° AugSeptember: average high 80 °F, low 57 °F 80°57° SepOctober: average high 71 °F, low 46 °F 71°46° OctNovember: average high 58 °F, low 36 °F 58°36° NovDecember: average high 47 °F, low 29 °F 47°29° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.55 in precipitation 3.5 JanFebruary: 3.65 in precipitation 3.6 FebMarch: 5.22 in precipitation 5.2 MarApril: 4.77 in precipitation 4.8 AprMay: 5.53 in precipitation 5.5 MayJune: 5.64 in precipitation 5.6 JunJuly: 4.31 in precipitation 4.3 JulAugust: 3.63 in precipitation 3.6 AugSeptember: 3.77 in precipitation 3.8 SepOctober: 4.01 in precipitation 4.0 OctNovember: 3.97 in precipitation 4.0 NovDecember: 4.07 in precipitation 4.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hodgenville Lincoln P, KY (12 mi away); precipitation: New Haven 6.4 Ne, KY (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

401077a
Boston, KY · 5 mi
400527a
New Hope, KY · 6 mi
400627a
Saint Francis, KY · 8 mi
427487a
Hodgenville, KY · 9 mi
400377a
Loretto, KY · 9 mi
400607a
Raywick, KY · 10 mi
400497a
Nerinx, KY · 10 mi
400047a
Bardstown, KY · 12 mi

Kentucky planting zones →

Questions about 40051

What planting zone is ZIP code 40051?

ZIP code 40051 (New Haven, KY) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in New Haven, KY?

The median last spring frost (32 °F) near 40051 is April 16; after May 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hodgenville Lincoln P station.

When is the first frost in New Haven, KY?

The median first fall frost near 40051 is October 25, giving a median frost-free growing season of 191 days.

When should I plant tomatoes in 40051?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 40051 get?

About 52.1 inches of precipitation a year (NOAA 1991–2020 normals, New Haven 6.4 Ne station).

How hot do summers get in New Haven, KY?

The average high peaks at 86 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 40051 have?

The USDA soil survey maps Trappist at the center of ZIP 40051: silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in New Haven, KY in 2026?

Spring leaf-out near 40051 came on Mar 2 in 2026, 6 days earlier than the 1991–2020 average (Mar 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in New Haven, KY?

Intermediate onions: the longest day near 40051 is 14 h 46 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 40051 change?

Yes. The 2012 USDA map put 40051 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.