For anyone having trouble with gophers, I had a major problem with them in January/February. I was desperate to get it under control before planting my garden because obviously, I didn't want to lose plants like I did last year. I tried non-toxic deterrent. I tried those vibrating stakes. I tried smoke bombs for gophers. Didn't work, didn't work, didn't work.
What DID work, finally, was the "Black Box" gopher trap I got at Home Depot. Gophers do not leave open holes they don't access. I went around and scraped my shoe over all the holes so I could find so I could see which ones opened back up quickest. That showed me where any active gopher was (Per google, gophers are solitary and only get together to breed. Babies leave moms relatively early and all go off their own way.) So whenever a hole would open back up, I would dig right there where the hole was, big enough so I could place the trap in it flat with the opening of the trap facing the tunnel. Then I covered it back up with dirt. The "irked" (BYC edited the p-word) gopher would go back to open up his hole and would walk right into the trap. I caught many within 20 minutes of setting the trap. A bar pops up so you can see when it's been set off and you press it down to release the dead gopher into the trash and reset the trap. Once I caught 3 in one day. It took about 2 months to completely erradicate the gopher population. I think I got about 12 gophers during that time. The traps aren't too expensive and are reusable. They also don't make the gopher bleed so there's no deterrent smell to unsuspecting gophers. I have to admit I got such a thrill seeing the silver bar sticking out of the ground. I hate destructive rodents!!