It's hard make the decision to open if you can't reliably cover your costs.  In 2012 the golf course I was president of decided to open in early April after the record warm March.  We brought back staff 3 weeks early, got a few good days in and then the weather turned shitty and we couldn't cover the costs we were incurring.  That was a setback for the member owned  9 hole course that has 6 month season.