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Frost is difficult to predict, though, because the air temperature within the vicinity of your garden can be several degrees higher than 32 degrees Fahrenheit the freeze point and yet it can still form on your plants. 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. However, if you do not have a specific frost blanket any type of material or cardboard box will provide temporary protection from thefrost. The side of the ditch that is closest to my house starts about 30 ft. from my house. Among the citrus types most easily killed or damaged by freezing weather are citrons, lemons and limes. However, if the temperatures are going to get below 28 F (-2 C) degrees watering can actually accelerate the rate of damage because the water can contain ice nucleators such as . 0 - 5 minutes (PURPLE)5 - 10 minutes (dark blue)10 - 30 minutes (blue) For example, using the wind chill chart, An air temperature of 0F with a wind speed of 15 mph will produce a wind chill temperature of -19F. Remove your covering once the temperature goes above freezing the next day. Short Answer. There exist some scales defining several degrees of frost severity (from "slight" to "very severe") but they depend on location thus the usual temperatures occurring in winter. Protect your tender and vulnerable plants by covering them with plastic sheets, blankets, row covers, bedsheets, and so on. Four Strategies to Protect Your Plants from Frost Keep the plants moist and apply a light fertilizer after all danger of frost has passed. Most pepper plants can only tolerate temperatures down to 32 degrees Fahrenheit (0 degrees Celsius) before they succumb to frost. Five of the records tracked-- all-time maximum and minimum . criticism of the dawn of everything Frost occurs when temperatures reach freezing, or 32 degrees. Other tender plants will need to be replanted in the spring. If the temperature reached 75F (in the East or North) or 80F (in the desert Southwest), the chance of the mercury falling below 32F at night is slim. About the NWS Knowing how to tell if your plants have frost killed them is important in order to avoid unnecessary waste of time and money. To keep your tomato plants productive for as long into autumn as possible they will need to be covered up each evening when temperatures dip below 50F (10C). The degree of possible frost damage to plants is due not only to temperature, but also humidity, the proximity of large structures, the amount of moisture in the soil, the age and health of the plants and other factors. Plants always killed by frost include summer annual flowers and summer vegetables like impatiens, marigolds, coleus, tomatoes and peppers.