After writing this post, I went to review the seeds on the co-op site. Turns out they posted planting instructions there:

Sowing Instructions
Direct sow seeds ¼ inch deep, any time of year in well prepared soil, tamp soil and keep moist until germination. Or sow in place anytime between early fall and late spring and let nature do its work after the rains come.

Haha, I am sure there are plenty of successful planting methods for dandelions. They are very sturdy things, after all! Mine did end up covered after being watered, so I guess I ended up planting them according to @SageScrub's instructions anyway. ;)