This year's strawberry season is getting off to a slow start. Cool temperatures that have extended well into June have delayed the season. Dave Mischler operates Mischler Berry Farm in Waupun. "You know we really do need some heat right now to get them berries to ripen up," Mischler told AM 1170WFDL's Between the Lines program. "The weather as far as being cool slowed the growth but we've got a lot of nice looking berries that are coming." Mischler's opens for strawberry picking at 7am Saturday. He tells am 1170 WFDL’s Between the Lines he'd already be done picking his early berries by this time. He says the farm is almost always picking by Father's Day, which was Sunday. Strawberry growers plant multiple varieties — early, late early, mid-season and late-season. The varieties ripen about four days apart, which lets farms stretch the picking out about a month. They say that this year, picking could extend into mid-July.