Town officials said the ban was part of a much larger ordinance that prohibited people from throwing objects classified as missiles, which included snowballs and stones, the news agency reports.
Brooke Best told HuffPost her son initially asked her to lead the charge to have the law changed.
That is, until Dane came along.
9-year-old Dane Best speaks in defense of snowballs at the Severance Town Council, Monday, Dec. 3, 2018.
While the ordinance was not enforced, it remained a law that the board says dates back to the town's founding in 1920.
The pair went on to became the first legal snowball-throwers in Severance's history.
Dane Best, who lives in the often snow-swept town just north of Windsor, presented his arguments at a town board meeting Monday night. "Little kids should be allowed to throw snowballs at each other".
While no one in Severance has actually been cited for throwing a snowball, the nine-year-old believed it was time to change the law for good. "The law was created many years ago".
"I think it's an outdated law", Dane said in the lead-up to the meeting.
Best made a decision to challenge the town board after learning several weeks ago that it was illegal to throw a snowball in the town that is home to almost 5,000, the Greeley Tribune reported.
Dane began writing letters with his classmates in support of overturning the ban and even circulated a petition.
Best satisfied other, more serious, questions, agreeing with the board that kids should not throw snowballs with rocks in them - and that they should not target windows. He then worked with Mayor Don McLeod and his parents to figure out exactly what steps needed to be taken to amend the ban on snowballs from the ordinance.
"We are proud of him for taking initiative to make some change, no matter how small it may be", said Derrick Best, Dane's father. "She called the town hall and then she told me I had to make a speech", he explained to CBS Denver.
'Especially at this age now, to be able to do that. He and his family also researched laws in Severance, as he prepared for his presentation. So Dane plans to launch a campaign on behalf of his (illegal) pet guinea pig.