Estimate freeze risk from forecast low temperature, expected time below freezing, wind speed, cloud cover, plant sensitivity, protection level, and terrain. This calculator is useful for gardeners, growers, outdoor plumbing checks, containers, and freeze-prep planning.
Forecast low:
The low temperature is the main freeze-risk factor. Colder temperatures increase the score.
Duration:
The longer temperatures stay below freezing, the higher the risk for plants, pipes, and outdoor items.
Clouds, wind, and terrain:
Clear skies and low spots can increase overnight cooling. Wind can add cold stress for exposed surfaces.
Protection:
Covers, shelter, garages, and heated spaces reduce the estimated freeze risk.
A freeze risk calculator is useful for protecting tender plants, checking garden beds, moving containers, preparing outdoor plumbing, planning greenhouse protection, and deciding whether extra overnight protection may be needed.
This is a rough planning estimate. Actual freeze damage depends on plant type, local microclimate, wind exposure, surface temperature, soil warmth, building heat, protection method, and official weather conditions.
Your result shows an estimated freeze risk score from 0 to 100. Higher scores mean colder temperatures, longer freeze duration, sensitive plants or objects, and less protection. Lower scores mean the entered conditions are less likely to cause freeze damage.
A freeze usually means air temperature reaches 32°F or lower. A hard freeze often refers to temperatures around 28°F or lower for several hours.
Frost is ice forming on surfaces. A freeze is air temperature at or below 32°F, which can damage sensitive plants even without visible frost.
Longer duration below freezing usually increases damage risk because plants, soil surfaces, containers, and exposed pipes have more time to cool.
Covers can reduce damage by trapping some ground warmth, but severe or long freezes may require heavier protection, moving plants indoors, or supplemental heat.