That would depend you your growing season. Optimally, that would be 6-7 months before your spring. That would leave 3-4 months incubation time (when the seed produces the tiny bulb), and 3 months for the cold treatment that will allow ensuing leaf growth. I don't know where Arcata is relation to temperature zones (you may want to add your zone to your profile under "Your account") so I am not sure how helpful my answer is. Your aim is to have them sprout when they normally would outside in your climate, so it will be well established and ready for winter.
That said, I can't say I always follow my own advice. Every year there is some fudging with some seeds, for whatever reason. Delayed hypogeal germinating seeds (which include martagons) that I receive in seed exchanges in January and February are usually held over until the following November. Alternatively, they could be just planted in spring, and hope they germinate ('cause you won't know until the following year when (or if) they send up a leaf.
