I heard of laying down bird netting with mulch over top. The person who uses this says it works every time. If you can't find bird netting, Gardens Alive! sells it, you can click on their name from our "Combating Pests" page to get to their site.

Another method would be to make a solution of hot peppers (Jalapeno or Habenero) and spray it over your flowerbeds. This is considered to be cruel because they get it on their paws, wipe it into their eyes and it really burns them.

Wire cages made from hardware cloth to protect bulbs works great. You could also plant bulbs that the chipmunks won’t bother; lilies, snowdrops, glory-of-the-snow, squills, irises, fritillaries, and hyacinths. Or line the planting hole with chipped stone, add stone around the sides of the bulbs but don’t cover the pointed tip.

Well-composted manure applied to the top of a bed is reported to repel them also.

Take juicy fruit gum, roll it up with your gloves on and stick it down their holes. They eat it (moles also) can't digest it and die.

Hav-A-Hart traps along with peanut butter will catch them for you to relocate elsewhere.

And finally there is a Rat and Mice Repellent that is not a poison so it won't harm children or pets but repels critters.

Sound like the easiest is a cat. I know for sure mine has killed many and chipmunks never even bothered anything around my yard even though I have lived in a wooded area, (I don't now but used to.)

Hope this all helps,wish you the best, Diane