Answer: Some strawberry types are called "June Bearing" and they produce a single heavy crop, followed by sporatic berries during the summer; the other type of strawberry is called "everbearing" and they produce heavily all summer long. So, it isn't unusual for your berry plants to be producing in June.
Strawberries are ripe when they are full colored and plump; their skins will shine. Overripe berries will begin to decline; lose their shine and become dull and wrinkled. Harvest one or two and taste them. If they're sweet and juicy, they're ripe. You can simply tug on a ripe berry and it should come right off the plant, cap and all. Underripe berries won't release with a gentle tug. You can cut them off if you wish.
Enjoy your berries!
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