Most western Oregon gardens have one or both common types of strawberries: the June-bearing ones and the "day-neutral" types, sometimes called "everbearers". They are treated differently. June bearing strawberries are fertilized sometime between mid-July and early August. If you fertilize a good-looking planting of June bearing strawberries in the spring, you can create too much of a leaf canopy which can lead to more fruit disease. A weak planting can be fertilized in the spring but it may not do any good if the problem is a root disease or root weevils. Day neutral strawberries can be fertilized in both spring and late summer.
The best times to transplant strawberries are in the mid-spring if you have a space to put them ready or in the early fall.
Most commercial June-bearing strawberries are clipped between mid July and early August.
I hope these comments help. Here is a link to an OSU publication on strawberries:
Please call/email if you have more questions. Chip Bubl OSU Extension/Columbia County 503 397-3462 email@example.com