Freeze

Table of freeze dates and average freeze dates for 2017
Table of freeze dates and average freeze dates for 2017

Growing Season Officially Over for Nebraska October 31, 2017

On Oct. 28, the last of Nebraska's Mesonet weather stations recorded a hard freeze of 28°F, effectively bringing the state's growing season to an end. A table shows dates for 28°F and 32°F freezes as well as average dates for these thresholds for 63 sites.

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3-0-day temperature forecast from the National Weather Service Climate Prediction Center

Forecast of End-of-Season Weather and Freeze Risk September 5, 2017

What's the likelihood you'll see a hard freeze prior to corn maturity? Check out the end-of-season forecast and a table showing risk of a hard freeze for various emergence dates and locations in Nebraska.

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Freeze damage to corn seedlings
Figure 1. (left) Yellow corn displaying damage from last week’s frost. Eighty to ninety percent of plants in this area of the field will likely recover, thus replanting would not be justified. Figure 2. Plant displaying frost injury. Both in Lancaster County, May 4, 2017. (Photos by Roger Elmore)

Do I Need to Replant My Corn? May 5, 2017

Considering whether your corn should be replanted? The authors look at types of plant damage at early growth stages and the effect on potential yield. It includes a table of relative yield potential of corn by planting date and population.

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Wheat variety trials exhibiting difference levels of storm damage
Figure 1. Wheat variety test plot northwest of McCook illustrates the difference in amount of damage among varieties from heavy wet snow and rain. (Photos by Robert Klein)

Be Patient When Assessing Winter Wheat Damage May 5, 2017

Additional time is needed to properly access the injury and potential yield loss of Nebraska winter wheat, given the cold temperatures that followed last week's below freezing temperatures, heavy wet snow, and high winds. It takes at least a week to 10 days of warm temperatures to make a quality assessment.

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Assessing Freeze Injury to Alfalfa April 28, 2017

While several areas of the state experienced lows below 28°F this week, widespread alfalfa losses are not expected at this time.

If you're concerned about whether your alfalfa may have suffered frost injury, remember that frozen alfalfa usually needs some time to recover before damage can be estimated.

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Frost-damaged corn
Figure 1. Buggy-whipping, shown hear in the two plants on the left, is when dead leaf tissue traps new leaf tissue, is one symptom of frost-damaged early season corn. (Archive photo by Roger Elmore)

Risk of Freeze Damage in Early-Planted, Emerged Corn April 28, 2017

Early-season freeze damage results in a range of potential yield impacts. Severe damage is often limited to low-lying areas within a field because cool air is heavier than warm air. Early season survival of corn plants is attributed to growing-point protection below the soil surface; however, a hard frost can penetrate the ground and kill plants. Regrowth of corn following freeze damage is often impeded by dead leaf tissue that can entrap new leaves.

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Field of wheat near McCook April 27, 2017.
A good, thick stand of wheat, such as this one near McCook provides a warmer microclimate near the soil surface that reduces the potential for freeze injury. (Photos by Robert Klein)

Assessing Freeze Injury to Wheat April 27, 2017

As temperatures dropped below 28° F at a number of sites this week, the authors address how to assess whether freeze damage has occurred.

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Nebraska map showing lows for April 26, 2017

Weather Data Shows Late April-May Cold Spells not that Uncommon in Nebraska April 26, 2017

Freezing temperatures were reported at numerous locations across western Nebraska the morning of Wednesday, April 26. Additional frost/freeze advisories were issued by the National Weather Service (Figure 1) for Thursday morning, encompassing most of west central to eastern Nebraska and north to the South Dakota border. The lowest temperature reported Wednesday morning at an NWS location was 27°F at Alliance and Sidney.

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