Early spring is best for prevention, queen wasps are scouting nesting spots then. Disturb mulch or ground cracks early and they move elsewhere.
Diatomaceous earth around entrances, soap spray inside holes, plus mint planted nearby. That triple action knocked out my wasp issue in under a week.
I’ll second cleaning up trims and debris, digger wasps need dry, bare soil to dig. Since I cleared garden clutter, no more wasp colonies in the backyard.”