I have had strawberries get large & start to turn red but they never "finish" in middle of winter. They taste terrible. I think they need more heat so if they were surrounded by plastic, 4 poles with plastic going around them & open on top might do better or in a greenhouse. Someone on GJ had a greenhouse that was just a glass window on a raised bed & lowered & raised with a stick to give them more air during the day(so they wouldn't cook) don't know what she was raising whether it was berries or some other crop. The window had several panes & was hinged on 1 side with 2 hinges so easy to lift up & adjust. it would probably give you the extra heat you need to get some good berries if you get a lot of sun where you are.-need raised bed or at least 1 side to be like a 2x8in. wide board so have something to hinge onto!!