The National Weather Service warns that:
FROST IS LIKELY LATE TONIGHT ACROSS MUCH OF CENTRAL AND WESTERN MINNESOTA AS TEMPERATURES DROP INTO THE LOWER 30S. PATCHY FROST IS POSSIBLE ELSEWHERE ACROSS THE OUTLOOK AREA WITH LOWS IN THE MIDDLE TO UPPER 30S.
The outlook for frost includes Anoka County and more than 40 other counties.
What is your routine for protecting plants in case of frost?