Some time after the events of the original special, Frosty decides to visit a group of village children, but is lonely when they go home. To ensure he's not alone and sad, the children build him a snow wife, Crystal, but his actions attract jealousy from the winter elemental Jack Frost, who wants rid of Frosty so the children can adore him instead.
Followed by the 1979 feature film Rudolph and Frosty's Christmas in July, which gave fans the chance to see Frosty and Crystal in stop-motion 3D, and as parents! The Rankin-Bass version of Frosty would return in 2005's The Legend of Frosty the Snowman, now voiced by Bill Fagerbakke. Not directly related to 1992's Frosty Returns, which is utilized as a companion to the original on television and home video, partially due to the split of Rankin-Bass holdings between NBCUniversal (productions from 1964-1973) and Warner Bros. (1974 and onward).
Frosty's Winter Wonderland provides examples of:
- Ascended Extra: Jack Frost would eventually star in his own Christmas Special, where he's a lovestruck cloudcuckoolander, though his characterization, appearance, and voice are totally different.
- Defrosting Ice King: Happens, literally and ironically enough to Jack Frost in when he is offered the opportunity to be the best man at Frosty's wedding to Crystal. He even mentions that he's always been the best man since the wedding is winter-themed.
- Distaff Counterpart: Crystal, Frosty's bride. She even has a similar-sounding voice courtesy of Shelley Winters.
- Easily Forgiven: Frosty and Crystal forgive Jack Frost pretty quickly, considering what he tried to do. (Of course, Christmas specials aren't big on comeuppance.)
- Early-Bird Cameo: During the "Walking in a Winter Wonderland" musical number as Frosty and Crystal are imagining life as a newlywed couple moments before getting married. Their snowchildren, Milly and Chilly make a brief appearance before making their proper debut in the 1979 crossover movie Rudolph and Frosty's Christmas in July.
- Expy: The red-haired girl serves as a stand-in for Karen.
- Green-Eyed Monster: Jack Frost's antagonism is due to the fact that he's jealous of the attention Frosty's getting.
- Happily Married: Frosty and Crystal get married in the climax of Winter Wonderland.
- Heroic BSoD: Frosty has a minor but emotional breakdown when he reveals to the children he's lonely every time they go back inside and he is left all alone. This gives them the idea to make him a wife.
- Love Imbues Life: The kids build Crystal, a snow-wife for Frosty. She receives the gift of life out of the love Frosty immediately felt for her, embodied in a bouquet of frost flowers he gives her. Later, a gust of wind snatches away Frosty's hat (turning him back into a non-sentient snowman) but Crystal's love allows him to become alive again without the need of his magic hat.
- HeelFace Turn: Jack Frost experiences one when Crystal acknowledges his importance and invites him to participate in the wedding and kisses him on the cheek, prompting him to exclaim "Happy birthday!" In subsequent specials, he's a friend and powerful ally every time he appears again.
- Ink-Suit Actor: Andy Griffith as the narrator, and Dennis Day as Parson Brown.
- Meaningful Name: Crystal is voiced by Shelley Winters, and Jack Frost is voiced by Paul Frees, whose surname is a homophone of "freeze".
- Single Tear: Frosty sheds one during his Heroic BSoD and again when the kids fail to bring Crystal to life.
- True Love's Kiss: Crystal's kiss grants Frosty permanent sentience, thwarting Jack Frost's efforts to destroy him by stealing his hat.
- Reasonable Authority Figure: Parson Brown may not be able to wed Frosty and Crystal himself, but offers to help the kids build a snow-parson to do so in his stead. Afterward, when Jack Frost and the kids want winter to last forever so Frosty and Crystal won't have to leave again, Parson Brown gently tells them how this wouldn't be good for the trees and flowers that are waiting for spring to come, since "nature made them a promise."
- Religion Is Magic: Parson Brown explains to the kids that he can't marry Frosty and Crystal since they aren't humans, and suggests they build a snow-parson who can do the job. They do, and Parson Brown brings it to life by giving it a Bible ("A parson's not a parson till he holds the Good Book in his hand!").
- Tears of Remorse: Frosty sheds them twice, first when he's upset at being left alone when the kids leave him, and again when failing to make Crystal all living by giving her a lady's hat.
- What Happened to the Mouse?: Frosty and his wife may be happy up in the Arctic, but whatever became of "Snow Parson Brown" who performed the wedding ceremony? He was alive too but isn't mentioned after the wedding.