Frost dates refer to the average dates in spring and fall when temperatures drop low enough to cause frost. These dates are crucial for gardeners and farmers, as they help determine the best times to plant and harvest crops. Knowing the frost dates for a specific area can prevent damage to sensitive plants. In many regions, the last frost date in spring marks when it's safe to plant tender plants like tomatoes and peppers. Conversely, the first frost date in fall signals when to prepare for colder weather, protecting plants from frost damage and ensuring a successful growing season.