Start seeds indoors six weeks before last frost date.
Sow at a depth of approx. 0.78 inches (2.0 cm) and aim for a distance of at least 0.78 inches (2.0 cm) between Tomato plants. Soil temperature should be kept higher than 12°C / 54°F to ensure good germination.By our calculations, you should look at sowing Dora about 42 days before your last frost date.
Plant to the first set of true leaves to promote strong root growth.
As Dora is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.A stable OP selection from a deliberate cross between Cherokee Purple and Brandywine done by Keith Mueller of Missouri, USA.