Freeze Watch Issued for Chicago Area as Frigid Temps Arrive

National Weather Service warns residents to protect plants and plumbing ahead of overnight freezing conditions.

Apr. 18, 2026 at 7:27pm

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A vast, atmospheric landscape painting in muted tones of gray, blue, and white, depicting a snow-covered field under a dramatic, cloudy sky. The scene conveys a sense of the overwhelming scale and power of extreme winter weather, with any physical structures or objects dwarfed by the expansive, moody perspective.A looming winter storm system brings the threat of freezing temperatures and frost to the Chicago region, underscoring the region's vulnerability to the raw power of nature.Chicago Today

The National Weather Service has issued a freeze watch for the entire Chicago area, with overnight temperatures expected to drop into the 20s on Sunday night and Monday morning. Residents are being urged to protect sensitive outdoor plants and irrigation systems, as frost or freeze could cause damage. The cold snap is expected to be short-lived, with temperatures rebounding into the 70s by Tuesday.

Why it matters

Sudden drops in temperature can pose significant risks to plants, gardens, and outdoor plumbing in the Chicago area. Advance warnings allow residents to take proactive measures to safeguard their property and avoid costly damage from the freezing conditions.

The details

According to the alert, the entire Chicago area except for Cook County will be under a frost advisory overnight Saturday into Sunday morning. Then on Sunday night and into Monday morning, the entire region will be under a freeze watch, with overnight lows expected to plummet into the 20s. Residents are being urged to cover or bring inside any sensitive outdoor plants, and to take steps to protect outdoor plumbing fixtures like sprinkler systems and spigots.

  • On Saturday night into Sunday morning, the entire Chicago area except Cook County will be under a frost advisory.
  • On Sunday night into Monday morning, the entire Chicago area will be under a freeze watch.

The players

National Weather Service

The federal agency responsible for weather forecasting and issuing alerts for the Chicago region.

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What they’re saying

“Residents are being urged to protect sensitive outdoor plants, as either frost or freeze could kill plants that are left unprotected. Those plants should be covered or brought inside if possible according to the National Weather Service.”

— National Weather Service

“Residents are also being encouraged to take steps to protect outdoor plumbing fixtures like sprinkler systems and spigots, as temperatures could drop enough for water to freeze in those appliances.”

— National Weather Service

What’s next

The cold snap is expected to be short-lived, with temperatures rebounding into the 70s by Tuesday.

The takeaway

This freeze watch highlights the importance of Chicago residents being prepared for sudden temperature drops, especially when it comes to protecting sensitive outdoor plants and plumbing from the risks of frost and freezing conditions.