The National Weather Service said temperatures will fall into the 20s between midnight and sunrise Saturday. The coldest temps will occur in valleys and similar sheltered areas, with warmer temps near the freezing mark along hilltops and higher elevations. Winds will be calm through Saturday morning.
Damage to unprotected vegetation is likely overnight. Fruit trees and orchards are particularly vulnerable. Potted plants normally left outdoors should be covered or brought inside tonight.
The forecast for the Grand Haven area:
Widespread frost after 2 a.m. Otherwise, clear, with a low around 32. Northwest wind around 6 mph becoming calm.
Widespread frost before 9 a.m. Otherwise, sunny, with a high near 58. South wind between 5 and 10 mph.
A 30-percent chance of showers, mainly after 10 p.m. Mostly cloudy, with a low around 43. South-southeast wind at around 7 mph becoming west.
Sunny, with a high near 55. West-northwest wind between 9 and 17 mph.