Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 68669 — Ulysses, NE

ZIP code 68669 (Ulysses, Butler County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 29 and the first fall frost October 9.

Where ZIP 68669 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 29

First frostOct 9

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 Ulysses, 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 Ulysses, NE

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 29median — 50% chance of a later frost

Safe for tender plantsMay 9only 10% chance of frost after

First fall frostOctober 9median — 10% chance by Sep 24

Growing season163 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 20 and returns around October 19.

From the NOAA station Surprise, NE — 4 miles away, elevation 1,545 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 68669

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 18 – Apr 1

SpinachSow outdoors · Mar 18 – Apr 8

Broccoli, cabbageStart indoors · Feb 18 – Mar 4

Broccoli, cabbageTransplant · Apr 8 – Apr 22

Onion setsPlant outdoors · Apr 1 – Apr 15

PotatoesPlant outdoors · Apr 8 – Apr 22

LettuceSow outdoors · Apr 1 – Apr 15

Carrots, beetsSow outdoors · Apr 8 – Apr 22

TomatoesStart indoors · Mar 4 – Mar 18

TomatoesTransplant · May 6 – May 20

Peppers, eggplantStart indoors · Feb 18 – Mar 4

Peppers, eggplantTransplant · May 13 – May 27

BeansSow outdoors · May 6 – May 20

Sweet cornSow outdoors · May 6 – May 20

Cucumbers, squashSow outdoors · May 6 – May 20

Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28

GarlicPlant cloves · Sep 25 – Oct 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Oct 9) 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 68669 came on Mar 13 — 17 days earlier than the 1991–2020 average (Mar 30).

average
Mar 302026
Mar 13

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 5b in Nebraska

420 plants native to the lower 48 states, recorded in Nebraska, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

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 Ulysses, NE.

Soil in Ulysses, NE

The soil mapped at the center of ZIP 68669 is Hobbs — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH6.9neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Hobbs silt 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 68669; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ulysses, NE

Summer high86 °Faverage high, July

Winter low12 °Faverage low, January

Hot days31days a year at 90 °F or more

Freezing nights150nights a year at 32 °F or less

Growing degree days3,179base 50 °F — the season’s usable heat

Longest day15 h 08 mindaylight on June 21

Shortest day9 h 13 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation28.3 inper year, rain and melted snow

Snowfall24 inper year; 47 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Surprise, NE (4 mi away); precipitation: Surprise, NE (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

686675b

Surprise, NE · 4 mi

684395b

Staplehurst, NE · 6 mi

683675b

Gresham, NE · 9 mi

686585b

Rising City, NE · 9 mi

David City, NE · 13 mi

Nebraska planting zones →

Questions about 68669

What planting zone is ZIP code 68669?

ZIP code 68669 (Ulysses, NE) 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 Ulysses, NE?

The median last spring frost (32 °F) near 68669 is April 29; after May 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Surprise station.

When is the first frost in Ulysses, NE?

The median first fall frost near 68669 is October 9, giving a median frost-free growing season of 163 days.

When should I plant tomatoes in 68669?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 68669 get?

About 28.3 inches of precipitation a year and 24 inches of snowfall (NOAA 1991–2020 normals, Surprise station).

How hot do summers get in Ulysses, NE?

The average high peaks at 86 °F in July, with about 31 days a year at 90 °F or more.

What kind of soil does 68669 have?

The USDA soil survey maps Hobbs at the center of ZIP 68669: silt loam, well drained, pH about 6.9 (neutral).

Did spring come early in Ulysses, NE in 2026?

Spring leaf-out near 68669 came on Mar 13 in 2026, 17 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ulysses, NE?

Long-day onions: the longest day near 68669 is 15 h 08 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).