Which zones?

Which zones?

I was curious what source/book people were referring to when they mentioned what zone they were in. The only source I have is Sunset's Western Garden book, where I am in the zone 4 region (south of puget sound). This book only covers the western US/Canada, and Alaska. I've notice people saying they were in New Jersey, and in the South...but that is not covered by my book. So I assume the zones you folks are referring to must be different.
If you knit: cheap, easy, and environmentally-friendly gift idea.

If you knit: cheap, easy, and environmentally-friendly gift idea.

Dahlias Blooming! Long Entry (sorry gardening gets me excited lately)

Dahlias Blooming! Long Entry (sorry gardening gets me excited lately)

Happy April Fools Day from This Old House

Happy April Fools Day from This Old House

Weed ID Please

Weed ID Please

Idea…

Idea…

My Humble Abode

My Humble Abode