Maryland Braces for First Widespread Frost of the Season

As of October 14th, 2025, the gloomy coastal low that has been affecting the Mid-Atlantic region is finally moving away, allowing sunshine to slowly return to Maryland. Behind the departing low, a dry cold front and strong Canadian high pressure will usher in much cooler and calmer conditions, setting the stage for the first widespread frost potential of the season later this week.

Over the next few days, Wednesday and Thursday will bring a chilly change to Maryland. Highs on Wednesday will range from around 70 degrees Fahrenheit in Baltimore to the mid-60s farther north and west, with a crisp northwest breeze. By Thursday, temperatures will drop even further, with highs in the low to mid-60s statewide and light winds. Thursday night looks particularly concerning, as clear skies and calm winds create ideal conditions for radiational cooling, leading to a high risk of frost, especially in the northern and western suburbs.

The areas at the highest risk for frost include Carroll, Frederick, and northern Howard counties, where temperatures could dip to 33-36°F. Northern Baltimore County and western Harford County also face a moderate frost potential, with lows near 35-38°F. Southern Baltimore County, Anne Arundel County, and Baltimore City are at a lower risk, with temperatures likely staying above 40°F and limiting widespread frost formation.