Freeze Risk

Hardiness zone map for 2023
USDA map for hardiness zones in Nebraska.

USDA ‘Hardiness’ Zone Sees Few Changes for Most of Nebraska

December 19, 2023
The new hardiness zone map for Nebraska has shifted the southernmost regions into a new zone — a refinement to the map due to a nearly doubled amount of available weather station data for the region.

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This Week on N Field: Frost and Prussic Acid

October 27, 2023
Sorghum, soghum-sudan and milo are great options for fall grazing, but producers should be cautious of frost damage and prussic acid prior to putting cattle out to graze.

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Closeup of combine harvesting soybean
While soybean residue can be grazed, it has much lower crude protein levels than soybeans, so producers using soybean residue as feed should also supplement to meet a dry cow's nutrient requirements..

Pasture and Forage Minute: Prussic Acid Following Freeze, Soybean Residue for Forage

October 12, 2023
Learn more about avoiding prussic acid poisoning in sorghum following a freeze, and why producers should always supplement when feeding soybean residue.

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Frozen sorghum-sudangrass
Once a freeze occurs, it takes seven days for prussic acid to dissipate from forage sorghum species like sorghum-sudangrass. The hours immediately after a frost have the highest level of toxic compounds in these plants.

Frosted Sorghum and Prussic Acid

October 6, 2023
A review on how to safely graze forage sorghum species after freezing temperatures.

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Frost damaged sorghum
If sorghum is at hard dough stage when temperatures dip to 28°F for a period of two hours, it may result in a yield reduction of around 20%.

Premature Frost Damage to Crops

October 14, 2022
UNL experts weigh in on the potential impacts for replant crops that experienced freezing temperatures Oct. 8 or may be at risk for a freeze this weekend.

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forecast low temperatures for September 9, 2020

Cold Air Event Expected Next Week, Frost Possible

September 2, 2020
The front is projected to begin its move through the state September 8 and produce widespread cold rains and strong winds statewide, with snow or a mix of snow and rain across the Nebraska Panhandle.

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Sorghum-sudan cover crop plant damaged by a light frost

Forage Hazards Following a Freeze Event

October 6, 2023
Freezing temperatures cause metabolic and cellular changes to our forage crops — prussic acid formation and nitrate poisoning are the biggest concerns. Learn more about these issues and how to avoid them.

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Nebraska map showing locations and dates of first hard freezes.

Forecast Offers Harvest Hope if Snows Stay North

October 8, 2019
With extended wet conditions this season, every precipitation event going forward has the potential to bring harvest activity to a grinding halt. The big question is how extensive will the delays be. Climatologist Al Dutcher offers good and bad news for some.

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