A forecast cold night is a reason to pause, check your plants and prepare a suitable cover—not a reason to assume that your historical frost date was wrong.
Check forecasts and plant sensitivity
Tender seedlings and warm-season plants are more vulnerable than established cold-tolerant crops. Check your local weather service for frost or freeze alerts. Historical normals help you plan weeks ahead; current forecasts help you act tonight.
Cover vulnerable plants
A plant cover can reduce heat loss on some cold nights. Support the fabric when needed, secure it appropriately, and follow the product instructions. Protection varies with material, wind, temperature and duration: a cover is not a universal guarantee against freezing.
Bring containers indoors
Portable containers and trays can often be brought into a sheltered space. If you have not transplanted yet, postponing planting may be easier than protecting a whole bed.
Check plants after the cold night
Watch for overheating as conditions warm. Follow local horticultural guidance for removing covers and assessing damage. Keep a small notebook of your garden’s colder corners to improve your plans next season.
Forecast and freeze-date sources
National Weather Service: local forecasts and alerts
NOAA: When to expect the first fall freeze