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

Planting zone for 37821 — Newport, TN

ZIP code 37821 (Newport, Cocke County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 7 and the first fall frost October 29.

Where ZIP 37821 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.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostApr 7
First frostOct 29
2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Newport, TN…

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 Newport, TN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 7median — 50% chance of a later frost
Safe for tender plantsApril 23only 10% chance of frost after
First fall frostOctober 29median — 10% chance by Oct 17
Growing season203 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 27 and returns around November 6.

From the NOAA station Newport 1 Nw, TN — within 1 mile, elevation 1,037 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 37821

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 24 – Mar 10
SpinachSow outdoors · Feb 24 – Mar 17
Broccoli, cabbageStart indoors · Jan 27 – Feb 10
Broccoli, cabbageTransplant · Mar 17 – Mar 31
Onion setsPlant outdoors · Mar 10 – Mar 24
PotatoesPlant outdoors · Mar 17 – Mar 31
LettuceSow outdoors · Mar 10 – Mar 24
Carrots, beetsSow outdoors · Mar 17 – Mar 31
TomatoesStart indoors · Feb 10 – Feb 24
TomatoesTransplant · Apr 14 – Apr 28
Peppers, eggplantStart indoors · Jan 27 – Feb 10
Peppers, eggplantTransplant · Apr 21 – May 5
BeansSow outdoors · Apr 14 – Apr 28
Sweet cornSow outdoors · Apr 14 – Apr 28
Cucumbers, squashSow outdoors · Apr 14 – Apr 28
Fall lettuce, spinachSow outdoors · Sep 3 – Sep 17
GarlicPlant cloves · Oct 15 – Nov 19
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 7) and first fall frost (Oct 29) 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 37821 came on Feb 23 — 4 days earlier than the 1991–2020 average (Feb 27).

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 7b in Tennessee

566 plants native to the lower 48 states, recorded in Tennessee, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

Trees 82

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 116

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 beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 184

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 157

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 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °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 Newport, TN.

Soil in Newport, TN

The soil mapped at the center of ZIP 37821 is Nelse — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter6%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Nelse sandy loam, 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 37821; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Newport, TN

Summer high88 °Faverage high, July
Winter low28 °Faverage low, January
Hot days31days a year at 90 °F or more
Freezing nights85nights a year at 32 °F or less
Growing degree days4,413base 50 °F — the season’s usable heat
Longest day14 h 36 mindaylight on June 21
Shortest day9 h 43 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation46.7 inper year, rain and melted snow
Snowfall3 inper year; 4 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 49 °F, low 28 °F 49°28° JanFebruary: average high 54 °F, low 31 °F 54°31° FebMarch: average high 62 °F, low 37 °F 62°37° MarApril: average high 72 °F, low 45 °F 72°45° AprMay: average high 79 °F, low 55 °F 79°55° MayJune: average high 85 °F, low 63 °F 85°63° JunJuly: average high 88 °F, low 67 °F 88°67° JulAugust: average high 88 °F, low 66 °F 88°66° AugSeptember: average high 83 °F, low 59 °F 83°59° SepOctober: average high 73 °F, low 47 °F 73°47° OctNovember: average high 61 °F, low 35 °F 61°35° NovDecember: average high 52 °F, low 31 °F 52°31° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.89 in precipitation, 1.8 in snowfall 3.9❄2 JanFebruary: 4.18 in precipitation, 0.8 in snowfall 4.2❄1 FebMarch: 4.29 in precipitation, 0.2 in snowfall 4.3 MarApril: 4.08 in precipitation 4.1 AprMay: 4.08 in precipitation 4.1 MayJune: 4.29 in precipitation 4.3 JunJuly: 4.93 in precipitation 4.9 JulAugust: 3.82 in precipitation 3.8 AugSeptember: 3.10 in precipitation 3.1 SepOctober: 2.42 in precipitation 2.4 OctNovember: 3.44 in precipitation 3.4 NovDecember: 4.17 in precipitation, 0.5 in snowfall 4.2❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Newport 1 Nw, TN (within 1 mile); precipitation: Newport 1 Nw, TN (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

378227b
Newport, TN · <1 mi
377137b
Bybee, TN · 8 mi
378437b
Parrottsville, TN · 9 mi
378907b
White Pine, TN · 9 mi
377227b
Cosby, TN · 11 mi
377257b
Dandridge, TN · 11 mi
377277b
Del Rio, TN · 11 mi
377537b
Hartford, TN · 12 mi

All 2 ZIP codes in Newport → · Tennessee planting zones →

Questions about 37821

What planting zone is ZIP code 37821?

ZIP code 37821 (Newport, TN) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Newport, TN?

The median last spring frost (32 °F) near 37821 is April 7; after April 23 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Newport 1 Nw station.

When is the first frost in Newport, TN?

The median first fall frost near 37821 is October 29, giving a median frost-free growing season of 203 days.

When should I plant tomatoes in 37821?

Start tomato seeds indoors around Feb 10 – Feb 24 and set transplants outside around Apr 14 – Apr 28, one to three weeks after the median last frost.

How much rain and snow does 37821 get?

About 46.7 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Newport 1 Nw station).

How hot do summers get in Newport, TN?

The average high peaks at 88 °F in July, with about 31 days a year at 90 °F or more.

What kind of soil does 37821 have?

The USDA soil survey maps Nelse at the center of ZIP 37821: sandy loam, well drained, pH about 6.5 (neutral).

Did spring come early in Newport, TN in 2026?

Spring leaf-out near 37821 came on Feb 23 in 2026, 4 days earlier than the 1991–2020 average (Feb 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Newport, TN?

Intermediate onions: the longest day near 37821 is 14 h 36 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37821 change?

Yes. The 2012 USDA map put 37821 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.