Optional Pre-Sprouting:

If you want to get a head start on the growing season, you can plant your tuber in moist (not wet) potting mix indoors under grow lights. Only water them if the soil has dried out. Tubers are prone to rotting before they have sprouted and produced roots. 

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Location Selection:

Dahlias need full sun, ideally at least 8 hours. They prefer well-draining soil as standing water can cause tubers to rot. 

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Planting:

You can plant your dahlia tubers when the danger of frost has passed and the soil temperature is at least 55°F.