When Should You Sow Tomato Seeds?

Almost all gardeners will start their tomato seeds indoors. The soil temperature should be 70° to 90°F. Under ideal conditions it normally takes 7-14 days for germination. Seedlings can be transplanted as soon as your garden soil temperatures reach 50°F and the nighttime temps don’t drop below 45°F. An inexpensive soil thermometer is an invaluable tool to determine soil temperatures, as ambient temperature, moisture content and soil composition can greatly affect the soil temperature.

tomato_seed_starting_trayWhen starting your tomato seeds indoors, you should plan to sow your seeds about 9 weeks prior to your estimated transplant date. The Old Farmer’s Almanac has a map to estimate the approximate transplant dates for your region, and if you scroll down, you’ll find a chart with the average last spring frost dates for your particular area. This chart, along with the Average Monthly Springtime Temperature for your state will give you the best guesstimate of about when you’ll be able to transplant your tomato seedlings. Of course, Mother Nature is always full of surprises. Frosts sometimes do not occur at all or can happen much later and more severely than forecast. We can do our best to estimate when it comes to sowing, transplanting and harvesting our crops, but we will not have the last word.

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