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

Planting zone for 47018 — Dillsboro, IN

ZIP code 47018 (Dillsboro, Dearborn County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 30 and the first fall frost October 16.

Where ZIP 47018 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 30
First frostOct 16
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 Dillsboro, 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 Dillsboro, IN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 15only 10% chance of frost after
First fall frostOctober 16median — 10% chance by Oct 3
Growing season168 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 17 and returns around October 26.

From the NOAA station Milan 5 Ne, IN — 12 miles away, elevation 974 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 47018

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 21 – Sep 4
GarlicPlant cloves · Oct 2 – Nov 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 16) 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 47018 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).

Soil in Dillsboro, IN

The soil mapped at the center of ZIP 47018 is Bonnell — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Bonnell silt loam, 12 to 18 percent slopes, severely 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 47018; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dillsboro, IN

Summer high83 °Faverage high, July
Winter low19 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights128nights a year at 32 °F or less
Growing degree days3,075base 50 °F — the season’s usable heat
Longest day14 h 54 mindaylight on June 21
Shortest day9 h 26 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation48.3 inper year, rain and melted snow
Snowfall16 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 37 °F, low 19 °F 37°19° JanFebruary: average high 41 °F, low 22 °F 41°22° FebMarch: average high 51 °F, low 30 °F 51°30° MarApril: average high 62 °F, low 39 °F 62°39° AprMay: average high 72 °F, low 50 °F 72°50° MayJune: average high 79 °F, low 59 °F 79°59° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 82 °F, low 60 °F 82°60° AugSeptember: average high 76 °F, low 53 °F 76°53° SepOctober: average high 65 °F, low 41 °F 65°41° OctNovember: average high 52 °F, low 32 °F 52°32° NovDecember: average high 41 °F, low 24 °F 41°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.50 in precipitation, 5 in snowfall 3.5❄5 JanFebruary: 3.16 in precipitation, 5.1 in snowfall 3.2❄5 FebMarch: 4.35 in precipitation, 2 in snowfall 4.3❄2 MarApril: 5.01 in precipitation, 0.1 in snowfall 5.0 AprMay: 5.32 in precipitation 5.3 MayJune: 4.92 in precipitation 4.9 JunJuly: 3.76 in precipitation 3.8 JulAugust: 3.14 in precipitation 3.1 AugSeptember: 3.64 in precipitation 3.6 SepOctober: 3.55 in precipitation, 0.3 in snowfall 3.5 OctNovember: 3.52 in precipitation 3.5 NovDecember: 4.38 in precipitation, 3.4 in snowfall 4.4❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Milan 5 Ne, IN (12 mi away); precipitation: Farmers Retreat, IN (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

470216b
Friendship, IN · 3 mi
470176b
Cross Plains, IN · 5 mi
470326b
Moores Hill, IN · 7 mi
470426a
Versailles, IN · 8 mi
470116b
Bennington, IN · 9 mi
470016b
Aurora, IN · 9 mi
472246b
Canaan, IN · 10 mi
470316b
Milan, IN · 10 mi

Indiana planting zones →

Questions about 47018

What planting zone is ZIP code 47018?

ZIP code 47018 (Dillsboro, 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 Dillsboro, IN?

The median last spring frost (32 °F) near 47018 is April 30; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Milan 5 Ne station.

When is the first frost in Dillsboro, IN?

The median first fall frost near 47018 is October 16, giving a median frost-free growing season of 168 days.

When should I plant tomatoes in 47018?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 47018 get?

About 48.3 inches of precipitation a year and 16 inches of snowfall (NOAA 1991–2020 normals, Farmers Retreat station).

How hot do summers get in Dillsboro, IN?

The average high peaks at 83 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 47018 have?

The USDA soil survey maps Bonnell at the center of ZIP 47018: silt loam, well drained, pH about 5.9 (moderately acidic).

Did spring come early in Dillsboro, IN in 2026?

Spring leaf-out near 47018 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 Dillsboro, IN?

Intermediate onions: the longest day near 47018 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 47018 change?

Yes. The 2012 USDA map put 47018 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.