Do you sun-dry the grounds first? I read wet clumps mold quickly. Maybe spreading dried grounds creates longer-lasting scent barriers? Testing this theory now!
Even if it’s 50% effective, I’ll keep using coffee waste! Better than pesticides leaching into groundwater. Plus, worms love grounds – healthier soil = stronger plants to survive gopher snacking. 
Used grounds attracted raccoons digging for food scraps in my garden! Switched to chili powder + coffee combo – furry bandits AND gophers steer clear now. 
My grandma from Italy swears by espresso rinds + human hair clippings (from salons) as gopher repellent. Tried it – weirdly worked? Maybe the combo smells like predators.
Coffee zones have 30% fewer new mounds vs untreated areas. BUT – earthworm activity doubled there! Gophers might avoid because worms aerate soil, making tunneling harder?
I’ve used coffee grounds around my plants, and while they didn’t get rid of the gophers, I did notice fewer pests in general. Maybe they just don’t like the smell.
After 3 months of testing, coffee grounds only worked when combined with castor oil spray. @SkepticalSue Have you tried this combo? The oil seems to make the scent last longer.
Too many coffee grounds can lower soil pH dramatically! Test your soil weekly if using this method. My blueberries loved it but my tomatoes suffered.
@GardenWarrior I second the castor oil mix! Used 1/4 cup oil + 2 tbsp dish soap per gallon of water with used grounds. Saw 80% fewer mounds in 2 weeks.
Place grounds in mesh bags near tunnel entrances. Makes cleanup easier and prevents ants from being attracted to scattered grounds.
University study showed gophers avoided coffee-treated areas for 7-10 days before returning. @EcoDefender is right about soil impact - use sparingly!
Important: Used espresso grounds work better than regular coffee! The stronger scent seems to deter gophers longer. Just keep pets from eating them.
Local coffee shops give away used grounds for free! Saved $50+ vs commercial repellents. @UrbanFarmer your oil recipe made them even more effective.
After 6 failed methods, what finally worked: solar sonic spikes + coffee ground perimeter. The dual approach seems to confuse and repel them best.
Mix in crushed garlic with your coffee grounds - the combo scent is extra offensive to gophers! Reapply after heavy rains for best results.
Coffee grounds work temporarily but won’t solve severe infestations. Best as part of an integrated approach with traps/barriers.