![]() The same thing applies when growing these crops under extreme cold at 32 degrees Fahrenheit and lower. High heat makes tomatoes more vulnerable to pests and disease.If the weather doesn’t cool down soon, they will stop ripening altogether. Once the temperature reaches 95 degrees, tomatoes will turn orange instead of developing the vibrant red tint they are known for.Likewise, the temperatures at night shouldn’t be over 70 degrees. Prolonged excess heat at 85 degrees or higher during the day will stop pollination and fruit production.Here are the risks your plant will have to face if you pick the wrong time of year to plant tomatoes: For warmer states in higher hardiness zones, planting in June or July is okay, but the intense heat during these months will hinder tomatoes’ growth and impact their health. ![]() Give the seeds eight weeks to grow before moving them outside. It’s best to plant tomato seeds indoors during mid-August for hot summer areas and in July for other regions at the latest.In these areas, it doesn’t matter much when you plant tomatoes, so long as the weather’s warm enough to enable growth (50 to 75℉) but not so hot that pollination fails to occur or the fruit turns orange. We’ve touched on this briefly in the intro, but if you’ve forgotten, hardiness zone 10 and higher, such as hotter regions in California and the Florida Keys, can accommodate tomato planting year-round due to the fact that they have little to no frost. ![]() Hardiness zones and indoor/outdoor planting Late-season tomat oes (grow in 80 days or more)Ģ. Mid -season tomatoes (grow in 70 to 80 days) The dates will often be three to four weeks longer than those for transplants.Įarly-season tomatoes (grow in under 50 to 70 days) ![]() Seed packages will also list this information, so you only need to check yours before gardening. As a reference, here are the main types of tomatoes-categorized by their days to maturity from transplants to harvest. You can do some simple math like in our example to determine your planting dates. If you plant Celebrity tomatoes, which take 70 days to mature from transplants and around 95 days from seeds, the latest time to sow tomato seeds would be July 31, while transplants may be set in the ground a bit later, on August 25. Suppose you live in Fair Oaks in Georgia, where the first frost falls on November 3. The result will be the latest date for growing tomatoes.
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