Instructables

Step 2: When to plant the seeds

Tomatoes are typically sown 6 to 8 weeks before the last anticipated frost. Some say to sow them later, more like 5 weeks before the last frost, but either will work. Keep in mind that the earlier you start, the larger the plants will be when you plant them out.

To find your average last frost date, go to http://cdo.ncdc.noaa.gov/cgi-bin/climatenormals/climatenormals.pl?directive=prod_select2&prodtype=CLIM2001&subrnum%20to%20Freeze/Frost%20Data%20from%20the%20U.S.%20Climate%20Normals

I live in Middle Tennessee and start my seeds in mid- to late-February.
 
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Whales5 years ago
O_O Middle Tennessee? thats weird so do I, I start my tomatos in April or MAy... but they are usually from little plants, I tried seeds this year, and I did it in March(late i know) but my whole garden flopped this year, so next year I'm going with just pots.