Keep in mind when planting that North pole OP is thought of as hardy, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea).
Growing North pole OP from seed
Transplanting North pole OP
In mild regions, plant right in the garden and in cooler regions, place in a cold frame.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as North pole OP is a hardy plant.