They will post flags when it is safe to skate. From the website: Safety first: all ice rinks are swept and resurfaced as needed. We monitor the ice daily and post flags to let skaters know when conditions are safe. Green flags indicate safe conditions, and red flags indicate unsafe conditions.
There are also rinks South of Illinois Street between Main Street and Naperville Rd where you can skate for free, courtesy of the Park District
The system is called "rainout" and there's both a call-in system and a mobile app that can tell you which rinks the park district has cleared for skating.
If you go to the wheaton park district website, there are links to recieve a text message when certain rinks/ponds are open for skating.
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