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

Planting zone for 68303 — Alexandria, NE

ZIP code 68303 (Alexandria, Thayer County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 24 and the first fall frost October 15.

Where ZIP 68303 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 24
First frostOct 15
2012 zone5b

Was 5b 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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Alexandria, NE…

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 Alexandria, NE

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 24median — 50% chance of a later frost
Safe for tender plantsMay 5only 10% chance of frost after
First fall frostOctober 15median — 10% chance by Sep 29
Growing season172 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 23.

From the NOAA station Hebron, NE — 11 miles away, elevation 1,480 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 68303

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 13 – Mar 27
SpinachSow outdoors · Mar 13 – Apr 3
Broccoli, cabbageStart indoors · Feb 13 – Feb 27
Broccoli, cabbageTransplant · Apr 3 – Apr 17
Onion setsPlant outdoors · Mar 27 – Apr 10
PotatoesPlant outdoors · Apr 3 – Apr 17
LettuceSow outdoors · Mar 27 – Apr 10
Carrots, beetsSow outdoors · Apr 3 – Apr 17
TomatoesStart indoors · Feb 27 – Mar 13
TomatoesTransplant · May 1 – May 15
Peppers, eggplantStart indoors · Feb 13 – Feb 27
Peppers, eggplantTransplant · May 8 – May 22
BeansSow outdoors · May 1 – May 15
Sweet cornSow outdoors · May 1 – May 15
Cucumbers, squashSow outdoors · May 1 – May 15
Fall lettuce, spinachSow outdoors · Aug 20 – Sep 3
GarlicPlant cloves · Oct 1 – Nov 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 15) 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 68303 came on Mar 12 — 13 days earlier than the 1991–2020 average (Mar 25).

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 6a in Nebraska

432 plants native to the lower 48 states, recorded in Nebraska, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Trees 31

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbitternut hickory75 ft · blooms mid spring · high shade tolerance · to −47 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack oak80 ft · blooms early spring · medium shade tolerance · to −30 °F

Shrubs 57

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 198

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °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 130

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbasin wildrye5 ft · blooms early spring · high shade tolerance · to −43 °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 8

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °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 Alexandria, NE.

Soil in Alexandria, NE

The soil mapped at the center of ZIP 68303 is Jansen — sandy clay loam, well drained.

TextureSandy clay loamholds water and nutrients; slow to drain and warm up
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Jansen-Meadin complex, 6 to 11 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 68303; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Alexandria, NE

Summer high89 °Faverage high, July
Winter low15 °Faverage low, January
Hot days40days a year at 90 °F or more
Freezing nights145nights a year at 32 °F or less
Growing degree days3,556base 50 °F — the season’s usable heat
Longest day15 h 03 mindaylight on June 21
Shortest day9 h 18 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation29.3 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 15 °F 37°15° JanFebruary: average high 41 °F, low 18 °F 41°18° FebMarch: average high 53 °F, low 27 °F 53°27° MarApril: average high 64 °F, low 38 °F 64°38° AprMay: average high 74 °F, low 50 °F 74°50° MayJune: average high 84 °F, low 61 °F 84°61° JunJuly: average high 89 °F, low 65 °F 89°65° JulAugust: average high 87 °F, low 63 °F 87°63° AugSeptember: average high 80 °F, low 53 °F 80°53° SepOctober: average high 67 °F, low 40 °F 67°40° OctNovember: average high 52 °F, low 27 °F 52°27° NovDecember: average high 40 °F, low 18 °F 40°18° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.80 in precipitation 0.8 JanFebruary: 0.85 in precipitation 0.8 FebMarch: 1.47 in precipitation 1.5 MarApril: 2.60 in precipitation 2.6 AprMay: 4.94 in precipitation 4.9 MayJune: 4.36 in precipitation 4.4 JunJuly: 3.34 in precipitation 3.3 JulAugust: 3.18 in precipitation 3.2 AugSeptember: 3.25 in precipitation 3.3 SepOctober: 2.18 in precipitation 2.2 OctNovember: 1.31 in precipitation 1.3 NovDecember: 0.98 in precipitation 1.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hebron, NE (11 mi away); precipitation: Fairbury 11.4 Nw, NE (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

683156a
Belvidere, NE · 7 mi
683626a
Gilead, NE · 7 mi
683226a
Bruning, NE · 8 mi
683386a
Daykin, NE · 10 mi
684536a
Tobias, NE · 10 mi
684166a
Ohiowa, NE · 10 mi
683706a
Hebron, NE · 11 mi
683526a
Fairbury, NE · 13 mi

Nebraska planting zones →

Questions about 68303

What planting zone is ZIP code 68303?

ZIP code 68303 (Alexandria, NE) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Alexandria, NE?

The median last spring frost (32 °F) near 68303 is April 24; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hebron station.

When is the first frost in Alexandria, NE?

The median first fall frost near 68303 is October 15, giving a median frost-free growing season of 172 days.

When should I plant tomatoes in 68303?

Start tomato seeds indoors around Feb 27 – Mar 13 and set transplants outside around May 1 – May 15, one to three weeks after the median last frost.

How much rain and snow does 68303 get?

About 29.3 inches of precipitation a year (NOAA 1991–2020 normals, Fairbury 11.4 Nw station).

How hot do summers get in Alexandria, NE?

The average high peaks at 89 °F in July, with about 40 days a year at 90 °F or more.

What kind of soil does 68303 have?

The USDA soil survey maps Jansen at the center of ZIP 68303: sandy clay loam, well drained, pH about 6.2 (slightly acidic).

Did spring come early in Alexandria, NE in 2026?

Spring leaf-out near 68303 came on Mar 12 in 2026, 13 days earlier than the 1991–2020 average (Mar 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Alexandria, NE?

Long-day onions: the longest day near 68303 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 68303 change?

Yes. The 2012 USDA map put 68303 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.