Our climates are obviously very different, I don't know your daily temperature ranges for day and night. But my volunteer tomatoes that have to sprout in the soil outdoors don't usually show up until June at the earliest, which is over 8-10 weeks after I sow them inside in the warm house (and a heat mat usually) So if your outdoor conditions are just not warm enough for tomato seeds, they won't sprout. If the days are warm enough to heat the seeds, can you at least carry the trays in overnight?
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Dee
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