It took months of planning and cost $450.
The 17-year-old passed a carnation to each of the 834 female students at Sky View High School, in Smithfield, on Thursday afternoon.
"I don't think anything can compare to seeing every girl in your life holding a flower as they walk through the halls," he wrote in a Facebook post.
Godfrey began anonymously sending Valentine's Day flowers to friends when he was 14 after spotting some girls didn't receive cards or gifts, ABC News reports.
"That broke his heart on Valentine's Day," said his mom, Erin Godfrey. "He wanted every girl to feel joy."
Each year, he sent out more flowers, but he decided to go all out in 2016 because "as many people as possible should be happy," reports 5NewsOnline.
"I firmly believe no girl should feel excluded on Valentine's Day," he told Mashable. "If it was up to me, Valentine's wouldn't be a day about couples, but a day about loving your fellow human beings."
Godfrey said his gesture was "more about kindness." "Not the lovey-dovey romantic stuff. It's more about trying to better society," he told KSL.
He worked part-time jobs in McDonald's, a Mexican restaurant and his local grocery store to save up enough cash to buy 900 carnations for 50 cents each from an online wholesaler.
Twenty friends helped Godfrey process the flowers, per Fox 8, and he distributed them throughout classrooms on Thursday.
School vice principal Kurt Hanks, who arranged for Godfrey to interrupt the classes to hand out the flowers, told Mashable it was a "really nice effort" and described the student as "an amazing kid."
Godfrey's girlfriend, Lilyan Sharp, said his selfless deed meant every girl at the school had a "giant smile on their face."
And so did she, as he also bought her tickets to see "A Great Big World" in Salt Lake City next month, KUTV reports.
Godfrey, who graduates in the spring, said people had thanked him countless times for his act of kindness.
He said he was sure he'd find something to do with the 66 blooms that were left over and now plans to continue creating Valentine's Day surprises for others in the future.
Also on HuffPost: