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

Planting zone for 42135 — Franklin, KY

ZIP code 42135 (Franklin, Simpson County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 5 and the first fall frost November 1.

Where ZIP 42135 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 5
First frostNov 1
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Franklin, 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 Franklin, KY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 5median — 50% chance of a later frost
Safe for tender plantsApril 19only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 21
Growing season210 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 26 and returns around November 11.

From the NOAA station Portland Sewage Plt, TN — 10 miles away, elevation 794 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 42135

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 22 – Mar 8
SpinachSow outdoors · Feb 22 – Mar 15
Broccoli, cabbageStart indoors · Jan 25 – Feb 8
Broccoli, cabbageTransplant · Mar 15 – Mar 29
Onion setsPlant outdoors · Mar 8 – Mar 22
PotatoesPlant outdoors · Mar 15 – Mar 29
LettuceSow outdoors · Mar 8 – Mar 22
Carrots, beetsSow outdoors · Mar 15 – Mar 29
TomatoesStart indoors · Feb 8 – Feb 22
TomatoesTransplant · Apr 12 – Apr 26
Peppers, eggplantStart indoors · Jan 25 – Feb 8
Peppers, eggplantTransplant · Apr 19 – May 3
BeansSow outdoors · Apr 12 – Apr 26
Sweet cornSow outdoors · Apr 12 – Apr 26
Cucumbers, squashSow outdoors · Apr 12 – Apr 26
Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20
GarlicPlant cloves · Oct 18 – Nov 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 5) and first fall frost (Nov 1) 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 42135 came on Feb 28 — about the same time as the 1991–2020 average (Mar 1).

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 Franklin, KY.

Soil in Franklin, KY

The soil mapped at the center of ZIP 42135 is Mountview — 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 groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Mountview silt loam, 2 to 6 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 42135; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Franklin, KY

Summer high89 °Faverage high, July
Winter low27 °Faverage low, January
Hot days38days a year at 90 °F or more
Freezing nights80nights a year at 32 °F or less
Growing degree days4,529base 50 °F — the season’s usable heat
Longest day14 h 41 mindaylight on June 21
Shortest day9 h 39 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation50.5 inper year, rain and melted snow
Snowfall4 inper year

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 45 °F, low 27 °F 45°27° JanFebruary: average high 50 °F, low 30 °F 50°30° FebMarch: average high 59 °F, low 37 °F 59°37° MarApril: average high 70 °F, low 47 °F 70°47° AprMay: average high 78 °F, low 57 °F 78°57° MayJune: average high 85 °F, low 65 °F 85°65° JunJuly: average high 89 °F, low 69 °F 89°69° JulAugust: average high 88 °F, low 67 °F 88°67° AugSeptember: average high 82 °F, low 60 °F 82°60° SepOctober: average high 71 °F, low 48 °F 71°48° OctNovember: average high 59 °F, low 37 °F 59°37° NovDecember: average high 49 °F, low 30 °F 49°30° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.79 in precipitation, 1.5 in snowfall 3.8❄2 JanFebruary: 3.96 in precipitation, 1.3 in snowfall 4.0❄1 FebMarch: 4.72 in precipitation, 0.6 in snowfall 4.7❄1 MarApril: 4.86 in precipitation 4.9 AprMay: 5.38 in precipitation 5.4 MayJune: 4.43 in precipitation 4.4 JunJuly: 4.25 in precipitation 4.3 JulAugust: 3.48 in precipitation 3.5 AugSeptember: 3.31 in precipitation 3.3 SepOctober: 3.70 in precipitation 3.7 OctNovember: 3.83 in precipitation 3.8 NovDecember: 4.83 in precipitation, 0.9 in snowfall 4.8❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Portland Sewage Plt, TN (10 mi away); precipitation: Franklin, KY (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

421347a
Franklin, KY · <1 mi
371197b
Mitchellville, TN · 7 mi
421707a
Woodburn, KY · 9 mi
371417a
Orlinda, TN · 10 mi
371487b
Portland, TN · 11 mi
370497b
Cross Plains, TN · 13 mi
421047a
Bowling Green, KY · 13 mi
422067a
Auburn, KY · 15 mi

All 2 ZIP codes in Franklin → · Kentucky planting zones →

Questions about 42135

What planting zone is ZIP code 42135?

ZIP code 42135 (Franklin, 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 Franklin, KY?

The median last spring frost (32 °F) near 42135 is April 5; after April 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Portland Sewage Plt station.

When is the first frost in Franklin, KY?

The median first fall frost near 42135 is November 1, giving a median frost-free growing season of 210 days.

When should I plant tomatoes in 42135?

Start tomato seeds indoors around Feb 8 – Feb 22 and set transplants outside around Apr 12 – Apr 26, one to three weeks after the median last frost.

How much rain and snow does 42135 get?

About 50.5 inches of precipitation a year and 4 inches of snowfall (NOAA 1991–2020 normals, Franklin station).

How hot do summers get in Franklin, KY?

The average high peaks at 89 °F in July, with about 38 days a year at 90 °F or more.

What kind of soil does 42135 have?

The USDA soil survey maps Mountview at the center of ZIP 42135: silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Franklin, KY in 2026?

Spring leaf-out near 42135 came on Feb 28 in 2026, about the same as the 1991–2020 average (Mar 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Franklin, KY?

Intermediate onions: the longest day near 42135 is 14 h 41 min, so day-neutral types bulb best; long-day varieties may not bulb fully.