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

Planting zone for 46374 — San Pierre, IN

ZIP code 46374 (San Pierre, Starke County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 25 and the first fall frost October 17.

Where ZIP 46374 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostApr 25
First frostOct 17
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for San Pierre, 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 San Pierre, IN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 25median — 50% chance of a later frost
Safe for tender plantsMay 11only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Oct 3
Growing season173 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around October 28.

From the NOAA station Wheatfield, IN — 8 miles away, elevation 666 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 46374

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 14 – Mar 28
SpinachSow outdoors · Mar 14 – Apr 4
Broccoli, cabbageStart indoors · Feb 14 – Feb 28
Broccoli, cabbageTransplant · Apr 4 – Apr 18
Onion setsPlant outdoors · Mar 28 – Apr 11
PotatoesPlant outdoors · Apr 4 – Apr 18
LettuceSow outdoors · Mar 28 – Apr 11
Carrots, beetsSow outdoors · Apr 4 – Apr 18
TomatoesStart indoors · Feb 28 – Mar 14
TomatoesTransplant · May 2 – May 16
Peppers, eggplantStart indoors · Feb 14 – Feb 28
Peppers, eggplantTransplant · May 9 – May 23
BeansSow outdoors · May 2 – May 16
Sweet cornSow outdoors · May 2 – May 16
Cucumbers, squashSow outdoors · May 2 – May 16
Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5
GarlicPlant cloves · Oct 3 – Nov 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 25) and first fall frost (Oct 17) 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 46374 came on Mar 21 — 15 days earlier than the 1991–2020 average (Apr 5).

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 San Pierre, IN

The soil mapped at the center of ZIP 46374 is Watseka — loamy sand, somewhat poorly drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter5%high
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Watseka loamy sand.

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 46374; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in San Pierre, IN

Summer high84 °Faverage high, July
Winter low16 °Faverage low, January
Hot days17days a year at 90 °F or more
Freezing nights135nights a year at 32 °F or less
Growing degree days3,119base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 12 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation41.7 inper year, rain and melted snow
Snowfall29 inper year; 37 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 32 °F, low 16 °F 32°16° JanFebruary: average high 37 °F, low 18 °F 37°18° FebMarch: average high 48 °F, low 28 °F 48°28° MarApril: average high 62 °F, low 37 °F 62°37° AprMay: average high 73 °F, low 49 °F 73°49° MayJune: average high 81 °F, low 59 °F 81°59° JunJuly: average high 84 °F, low 62 °F 84°62° JulAugust: average high 82 °F, low 60 °F 82°60° AugSeptember: average high 77 °F, low 52 °F 77°52° SepOctober: average high 65 °F, low 41 °F 65°41° OctNovember: average high 50 °F, low 31 °F 50°31° NovDecember: average high 38 °F, low 22 °F 38°22° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.74 in precipitation, 10 in snowfall 2.7❄10 JanFebruary: 2.44 in precipitation, 9.1 in snowfall 2.4❄9 FebMarch: 2.70 in precipitation, 3.5 in snowfall 2.7❄4 MarApril: 3.58 in precipitation, 0.5 in snowfall 3.6❄1 AprMay: 4.13 in precipitation 4.1 MayJune: 4.48 in precipitation 4.5 JunJuly: 4.29 in precipitation 4.3 JulAugust: 4.86 in precipitation 4.9 AugSeptember: 3.32 in precipitation 3.3 SepOctober: 3.59 in precipitation 3.6 OctNovember: 3.01 in precipitation, 1.3 in snowfall 3.0❄1 NovDecember: 2.56 in precipitation, 4.6 in snowfall 2.6❄5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Wheatfield, IN (8 mi away); precipitation: N Judson 3 S, IN (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

463805b
Tefft, IN · 4 mi
463665b
North Judson, IN · 7 mi
463485b
La Crosse, IN · 7 mi
479575b
Medaryville, IN · 8 mi
463925b
Wheatfield, IN · 8 mi
463475b
Kouts, IN · 9 mi
463405b
Hanna, IN · 14 mi
463905b
Wanatah, IN · 15 mi

Indiana planting zones →

Questions about 46374

What planting zone is ZIP code 46374?

ZIP code 46374 (San Pierre, IN) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in San Pierre, IN?

The median last spring frost (32 °F) near 46374 is April 25; after May 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wheatfield station.

When is the first frost in San Pierre, IN?

The median first fall frost near 46374 is October 17, giving a median frost-free growing season of 173 days.

When should I plant tomatoes in 46374?

Start tomato seeds indoors around Feb 28 – Mar 14 and set transplants outside around May 2 – May 16, one to three weeks after the median last frost.

How much rain and snow does 46374 get?

About 41.7 inches of precipitation a year and 29 inches of snowfall (NOAA 1991–2020 normals, N Judson 3 S station).

How hot do summers get in San Pierre, IN?

The average high peaks at 84 °F in July, with about 17 days a year at 90 °F or more.

What kind of soil does 46374 have?

The USDA soil survey maps Watseka at the center of ZIP 46374: loamy sand, somewhat poorly drained, pH about 6.5 (neutral).

Did spring come early in San Pierre, IN in 2026?

Spring leaf-out near 46374 came on Mar 21 in 2026, 15 days earlier than the 1991–2020 average (Apr 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in San Pierre, IN?

Long-day onions: the longest day near 46374 is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).