Strains i have grown that finished 100% at 43° north in the north west usa are...
Dinafem Blue widow all finished at the beginning of october with 8+ potency and a respectable yeild.
Sagarmarga early riser very consistant plants of a large yeild, finished completely here at sept 20th, good potency 7.5 with a happy sativa high and great outdoor bag appeal of lime green crystaly buds.
Next generation texada timewarp, my best yeilding outdoor strain 1 pound + of lemony smelling buds of a good all around buzz id give potency a 7, plants very consistant with great mold resistance finished early october at the latest here.
Guerilla gold 3 from rcmc is a very early plant (early september) that yeilds 4-6 zips started in may but mold resistance sucks the taste hashy and imo the best phonos potency is only at a 6 other than that its a good solid early strain guaranteed harvest for those closer to 50° north im kinda harsh on potency as im a heavy smoker.
I have been growing outdoors for about ten years now and the first three i grow every year they are my staple strains, i mention the gg3 because i feel everyone should try it if they are way up north, its a good base breeding plant crossed to early riser it increased potency and bag appeal, yeild as gg3 buds are dense, and finished sep 15 at latest with little mold. Hope this helps a few northern growers!