Here is an FAQ from Maryland.
https://www.marylandattorneygeneral.gov/Pages/COVID19/default.aspx
Most contracts won't be completely clear on this. Most will have something that you have to pay for snow closures and quite possibly other broader language about emergencies. Depending on what the contract states exactly, a parent would have a better or worse argument.
But, these policies are written by the daycare and a fundamental tenet of contract interpretation is that ambiguities are interpreted against the drafter. So, if the policy isn't clear that payment is due under such circumstances, you would have a decent argument.
10. My child's daycare/preschool is closed but is still collecting tuition. Can they do that?
You may wish to first look at the terms of your contract to see if it includes any language about what your responsibility is in a situation like this. If it doesn't say anything and you're not able to resolve the matter with the daycare provider or preschool, you can file a complaint with our Consumer Protection Division; we may be able to mediate with the provider on your behalf.
To submit a complaint on our website, go to www.marylandattorneygeneral.gov. Click on "File a Consumer Complaint" and choose the General Complaint Form. You can also download a paper complaint form, including instructions for filing, from our website. Alternatively, you may send a letter describing your complaint, along with copies of relevant documentation to: Consumer Protection Division, 200 St. Paul Place, Baltimore, MD 21202. Instead of mailing, you may fax this information to 410-576-7040. We are unable to accept complaints by email.