Pinus parviflora , Japanese White Pine , sow 3 months moist cold @ 39F, move to 70F for germination.

Pinus thunbergii, Japanese Black Pine, sow 2-3 months moist cold, move to 70F for germination. Very fresh seeds may germinate quickly.

Acer buergerianum , Trident Maple , sow moist cold @ 39F for germination in 6 to 8 weeks - watch these, they may germinate at cool temperatures before you remember to bring them out to warm

Taxodium distichum, Bald Cypress, pour very hot water over seeds (just short of boiling) to help remove resin coating prohibiting water from breaching the seed. Moist cold 39F 60 days, then bring to warm.

All of these could be sown and placed outdoors now in your zone and exposed to a range of temperatures for Spring germination.

Be sure to check out the Tree Forum here too. They have a bunch of great FAQ's and discussion tips there about growing many different varieties from seed.

Dave

Here is a link that might be useful: Tree Forum - Growing from Seed