Freeze Warning Issued for Lehigh Valley

Overnight temperatures could dip below freezing, putting crops and plumbing at risk

Apr. 20, 2026 at 11:52am

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A sweeping, atmospheric landscape painting in muted tones of gray, blue, and white, depicting a vast, frozen field under a heavy, overcast sky. The scene conveys the overwhelming power and scale of the natural world, with the frozen ground and ominous clouds dwarfing any small structures or vegetation in the distance.The Lehigh Valley braces for a sudden spring freeze that could devastate crops and outdoor infrastructure.Allentown Today

The National Weather Service has issued a freeze warning for the Lehigh Valley region of Pennsylvania, with overnight temperatures expected to drop below freezing on Tuesday morning. The cold front will bring a significant temperature drop after several days of warmer weather in the 70s and 80s, potentially damaging crops and outdoor plumbing if precautions are not taken.

Why it matters

Sudden freezing temperatures can pose a serious threat to the region's agricultural industry, as well as homeowners with exposed outdoor pipes. The Lehigh Valley has been experiencing drought conditions, making crops and plants more vulnerable to frost damage. This freeze warning allows residents and farmers time to prepare and protect their property.

The details

According to the National Weather Service, a low of 26 degrees Fahrenheit is expected overnight Monday into Tuesday in the Lehigh Valley. The freeze warning will be in effect from midnight until 9 a.m. on Tuesday. Forecasters say a strong cold front will move through the region on Monday, bringing temperatures down significantly from the 70s and 80s experienced just days prior.

  • The freeze warning will be in effect from midnight until 9 a.m. on Tuesday, April 21, 2026.
  • Temperatures are expected to drop to a low of 26 degrees Fahrenheit overnight Monday into Tuesday.

The players

National Weather Service

The federal agency responsible for weather forecasting and issuing warnings for the United States.

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What they’re saying

“Good Monday morning! Several areas are colder early this morning than originally forecast, therefore some frost to greet the early risers. A more widespread freeze is expected tonight and early Tuesday morning. Protect the cold sensitive plants!”

— NWS Mount Holly, National Weather Service Mount Holly, New Jersey

What’s next

Residents and farmers in the Lehigh Valley should take steps to protect crops, plants, and outdoor plumbing from the expected overnight freeze on Tuesday morning.

The takeaway

This sudden cold snap serves as a reminder that even in the spring, the Lehigh Valley region remains vulnerable to freezing temperatures that can threaten the local agricultural economy and homeowners. Vigilance and preparation are key to mitigating the potential damage from this freeze warning.