Because of the delay on the baseball field, the softball project was actually started beforehand and work was done durng the summer – before anything could be done on baseball for the reason you cite. Then work came to a halt because the subcontractor dropped the ball and its feet were not held to the fire. Mostly, what remained was laying the outfield sod and this did not conflict with the baseball project. This could have been done by the end of November.
In addition, winter did NOT start early so there was ample time to have gotten this done. Once winter did begin, it was especially severe and lasted longer than normal, but this would never had been an issue had the contractor and subcontractor done the job they agreed to do.
Of course, now they are using the weather excuse to avoid responsibility. Has work now begun or is the weather still too severe?