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Low temperatures may or may not reach freezing but moisture must be in the picture for frost to develop. Chapter 4 - Frost Damage: Physiology and Critical Temperatures What Is The Smallest Form Of Precipitation? Mean number of annual frost free days in Wyoming (PRISM, 1961-90) In the mountains and high valleys freezing temperatures may occur any time during the summer. If you were measuring 35 degrees several feet up you might find the lawn temperature where the coldest air settled to be 31 or 32 degrees, which is cold enough for frost to form. Here is a temperature table of when some vegetable plants get frost damage: TEMPERATURES DAMAGING TO VEGETABLE PLANTS, S/NVegetable PlantsTemperature (F)1Spinach30-322Asparagus30-313Okra29-304Broccoli29-305Cabbage26-286Cucumbers30-327Carrots28-308Tomatoes32-349Sweet corn32-3310Beans31-3211Peas28-30. Weather Safety Rules Frost forms when. Therefore dont cover rose bushes until at least one hard frost occurs for effective rose winter protection. Notice on the right side of the image above, the readings taken at night are cooler closer to the ground. Plastic will transmit cold air to the plants, causing more harm than good. Polypropylene becomes brittle at these temperatures, reducing the working life of your frost cloth. All NOAA. Frost damages plants, which can be devastating to the overall health of the plant. The technical storage or access that is used exclusively for statistical purposes. Plants can tolerate a wide range of temperature ranges, but there are specific threshold temperatures that must be met before they will grow and flourish. Daily Temp/Precip Maps Some people think that if they spray water on the frosty leaves, they will wash off the frost and kill it. Tornado Machine Plans, Weather Safety The Belle Glade tower showed a 14 degree temperature rise from 2 feet to 30 feet! This fog is often a brownish-yellow color, leading to the name.