Narrowbanding was mandated to be done by January 01, 2013. There are some that missed the deadline, but it doesn't appear that Tulare County did. Their license for the Sheriffs Office shows narrowband FM and P25.
I read an article about the county remodeling a building to house the Sheriff, Fire and Emergency Operations Center. While they mentioned upgrading, I don't believe they mentioned anything about new radios, unless it came out in a different article.