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

Planting zone for 47521 — Celestine, IN

ZIP code 47521 (Celestine, Dubois County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 10 and the first fall frost November 1.

Where ZIP 47521 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 10
First frostNov 1
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 Celestine, 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 Celestine, IN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 10median — 50% chance of a later frost
Safe for tender plantsApril 26only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 20
Growing season204 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 11.

From the NOAA station Patoka Lake, IN — 2 miles away, elevation 561 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 47521

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 27 – Mar 13
SpinachSow outdoors · Feb 27 – Mar 20
Broccoli, cabbageStart indoors · Jan 30 – Feb 13
Broccoli, cabbageTransplant · Mar 20 – Apr 3
Onion setsPlant outdoors · Mar 13 – Mar 27
PotatoesPlant outdoors · Mar 20 – Apr 3
LettuceSow outdoors · Mar 13 – Mar 27
Carrots, beetsSow outdoors · Mar 20 – Apr 3
TomatoesStart indoors · Feb 13 – Feb 27
TomatoesTransplant · Apr 17 – May 1
Peppers, eggplantStart indoors · Jan 30 – Feb 13
Peppers, eggplantTransplant · Apr 24 – May 8
BeansSow outdoors · Apr 17 – May 1
Sweet cornSow outdoors · Apr 17 – May 1
Cucumbers, squashSow outdoors · Apr 17 – May 1
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 10) 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 47521 came on Mar 3 — 11 days earlier than the 1991–2020 average (Mar 14).

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 Celestine, IN.

Soil in Celestine, IN

The soil mapped at the center of ZIP 47521 is Gilpin — 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 matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Gilpin silt loam, 12 to 18 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 47521; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Celestine, IN

Summer high92 °Faverage high, July
Winter low23 °Faverage low, January
Hot days73days a year at 90 °F or more
Freezing nights102nights a year at 32 °F or less
Growing degree days4,317base 50 °F — the season’s usable heat
Longest day14 h 51 mindaylight on June 21
Shortest day9 h 29 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation51.7 inper year, rain and melted snow
Snowfall13 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 23 °F 42°23° JanFebruary: average high 47 °F, low 25 °F 47°25° FebMarch: average high 57 °F, low 33 °F 57°33° MarApril: average high 69 °F, low 43 °F 69°43° AprMay: average high 78 °F, low 55 °F 78°55° MayJune: average high 87 °F, low 64 °F 87°64° JunJuly: average high 92 °F, low 67 °F 92°67° JulAugust: average high 90 °F, low 65 °F 90°65° AugSeptember: average high 83 °F, low 58 °F 83°58° SepOctober: average high 73 °F, low 47 °F 73°47° 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 · ❄ = snowfall

0″2″4″6″January: 3.43 in precipitation, 4.1 in snowfall 3.4❄4 JanFebruary: 3.18 in precipitation, 3.5 in snowfall 3.2❄4 FebMarch: 4.49 in precipitation, 1.1 in snowfall 4.5❄1 MarApril: 5.73 in precipitation 5.7 AprMay: 6.02 in precipitation 6.0 MayJune: 5.17 in precipitation 5.2 JunJuly: 4.76 in precipitation 4.8 JulAugust: 3.23 in precipitation 3.2 AugSeptember: 3.98 in precipitation 4.0 SepOctober: 3.62 in precipitation, 0.2 in snowfall 3.6 OctNovember: 4.11 in precipitation 4.1 NovDecember: 3.95 in precipitation, 3.8 in snowfall 4.0❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Patoka Lake, IN (2 mi away); precipitation: Dubois S In Forage Fm, IN (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

475806b
Schnellville, IN · 4 mi
475276b
Dubois, IN · 5 mi
475136b
Birdseye, IN · 7 mi
475756b
Saint Anthony, IN · 7 mi
474326b
French Lick, IN · 7 mi
471166b
Eckerty, IN · 8 mi
475476b
Jasper, IN · 9 mi
475496b
Jasper, IN · 9 mi

Indiana planting zones →

Questions about 47521

What planting zone is ZIP code 47521?

ZIP code 47521 (Celestine, 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 Celestine, IN?

The median last spring frost (32 °F) near 47521 is April 10; after April 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Patoka Lake station.

When is the first frost in Celestine, IN?

The median first fall frost near 47521 is November 1, giving a median frost-free growing season of 204 days.

When should I plant tomatoes in 47521?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 47521 get?

About 51.7 inches of precipitation a year and 13 inches of snowfall (NOAA 1991–2020 normals, Dubois S In Forage Fm station).

How hot do summers get in Celestine, IN?

The average high peaks at 92 °F in July, with about 73 days a year at 90 °F or more.

What kind of soil does 47521 have?

The USDA soil survey maps Gilpin at the center of ZIP 47521: silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Celestine, IN in 2026?

Spring leaf-out near 47521 came on Mar 3 in 2026, 11 days earlier than the 1991–2020 average (Mar 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Celestine, IN?

Intermediate onions: the longest day near 47521 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 47521 change?

Yes. The 2012 USDA map put 47521 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.