HeartsDelight
Songster
There are many species.We have tons of plantain on our farm I've never seen any with hairs like that nor does it turn purple in frost. Maybe its a slightly different species though?
Our plantain is one of our chickens favorite treats.
Plantago subnuda (a California native species) is particularly hairy as seedlings and young plants, but retains some even to adulthood. This is absolutely unlikely to be subnuda due to the OP's location, but it looks similar enough with only a few leaves that the hairiness looks genus-normal to me.