[dxf]

Mr. Rogers didn't start his children's programming work in Canada. That started when he worked on Josie Carey's (https://en.wikipedia.org/wiki/Josie_Carey) show The Children's Corner on WQED in Pittsburg. Several of the puppets he used on Mr. Rogers's Neighborhood were first seen on The Children's Corner.

[Woberto]

I think OP was referring to how Mr. Rogers introduced the show to a Canadian viewership, not him starting the show there

[chimeracoder]

No, he started programming for children earlier, but the show Misterogers [sic] began in 1962 in Canada.

It later became Mister Rogers' Neighborhood [sic], which is what we know and remember him for today.

Some of the puppets he used were first introduced in Children's Corner in the 1950s, but the first show to carry his name, in any form, and starring him, was Misterogers in Canada.

[lupire]

More specifically and importantly, Misterogers in Canada was the first time Fred himself appeared on TV showing his face as a major character (and possiblly in any way) in a show.

[dxf]

Oh, I think you may be right. Thanks!

[chimeracoder]

I explain in more detail below, but: Mr. Rogers began children's programming work earlier in the 1950s, but the show we know him for today began in Canada as Misterogers in the 1960s.