It’s probably time to bid farewell to the last of the outdoor plants that were hanging on amid the recent cold snap.

A freeze warning is in effect for Allegheny County and much of the rest of southwestern Pennsylvania overnight Friday into Saturday morning, with temperatures that could plummet into the lower 30s around Pittsburgh and into the upper 20s in some parts of the region.

The warning will be in effect from midnight through 9 a.m. Saturday.

Frost and freeze conditions could kill crops and other sensitive vegetation, the National Weather Service office in Moon said. Unprotected outdoor plumbing also could suffer damage.

Areas north of Allegheny County likely won’t fall below freezing because of cloud cover moving southeast off of the Great Lakes, the weather service said.

The c

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