If you're searching for Sikome Lake opening dates in Calgary, you're looking in the wrong province. Sikome Lake is located in Cypress Hills Interprovincial Park, Saskatchewan—about 650 km (400 miles) east of Calgary.
Calgarians often visit Cypress Hills for camping and skiing (Hidden Valley). The park is a popular 6–7 hour drive from Calgary, so many assume the lake is "in Calgary." But it's firmly in Saskatchewan.
If you want a lake near Calgary, consider:
For exact 2024 opening dates, fees, and conditions, check SaskParks or the Cypress Hills Provincial Park Facebook page. Alberta Parks manages the AB side of the park separately.