What are some practical ways to protect tomatoes from frost?

    Light frost generally does not cause major harm to well-hardened, strong seedlings, but low temperatures of 0°C lasting more than 5-6 hours are extremely harmful. You should prepare for frost protection based on the weather forecast. There are generally the following 3 methods.
    1. Covering method. Tomato frost damage generally occurs within a few days after transplanting in the open field. Since the seedlings are small, the covering method can achieve ideal frost protection results.
    Straw curtain covering method: Take a lightweight straw curtain, and with two people holding each end, gently cover the seedlings just before the frost. Be careful not to break the seedlings by pressing them down. After the temperature rises the next day, gently remove it.
    Plastic film covering method: Gently lay plastic film over the seedling bed so it clings to the plants, and press down both ends on the bed ridges with mud, bricks or other heavy objects. Generally, a low temperature of -1°C can be safely withstood. At temperatures below -2°C, the leaves and stems in a few spots where they are pressed tightly against the film may suffer frost damage, but there will be no major frost loss.
    Cap-style covering method: Use plastic cups, small flower pots, or homemade thick paper cups left over from seedling raising to cover each plant before the frost. Paper cups and plastic cups should be pressed down with soil to prevent them from being blown around. Generally, at a low temperature of -2°C, the plants will remain safe and sound.
    Soil covering method: If the seedlings are relatively small, there is no watering in the bed, and the soil is soft and loose, you can gently bend the seedlings down and cover them with soil using a shovel. After the frost passes the next day, slowly dig them out. The frost protection effect is good, but it is relatively labor-intensive.
    Plants grown on small raised beds are prone to being bent and broken, so the latter two methods can be used.
    2. Watering method. Water thoroughly once before the frost arrives. Because water vapor condensation can also release some heat, watering can generally help the plants escape the harmful effects of a 0°C frost.
    3. Smoking method. When the frost comes, light grass piles to produce smoke. The smoke can cause water vapor to condense and release some heat, and can also isolate the invasion of cold air. Generally, a 0°C frost can also be avoided.  
    The above content is for reference only.