About 6 years ago, preparing to move back into the home place here, I had some hornets build a nest under the eave of the patio, right above the steps, to go across, and into the house. I really didn't see it until it was about the size of a softball. After that, I went around to the other set of steps. It was still pretty warm, but it was supposed cool off into the 50's in a couple days. I got 2 cans of spray, and waited until that cool morning, figuring they'd be a little sluggish.
When I pulled in that morning, to my surprise that nest was in shreds on the steps, and a few stragglers buzzing/crawling around. I made quick work of them, then took a good look. I could see muddy paw prints on the 4 X 6 header, so followed it back to a 2" pipe upright supporting the roof, then on back to one of the seats on the picnic table. Apparently, a Raccoon had seen the nest, and was waiting for cool weather too.
What I'd have given to see that Coon tear that apart, to get to the hornets.
We've had them in the Maple tree's in the yard though the summer, but never got stung mowing around them. Once it hits freezing temps, the birds tear into them, and chow down.
We also do a lot of trail riding by horse back in the summer, and mostly in State Forests. In July and August when it's normally dry, you'll get reports of Yellow Jacket ground nests on the trail, usually around tree roots. If it's just 1-2 people, it's usually not a problem stirring them up. But when a group of 4, or more ride together, it's usually the 4th horse on back, that will get stung. Apparently the first few horses hooves hitting the tree roots stirs them up. You're always prepared to hear someone shout, BEES..!! Who ever is in the front of the group, best be ready to move out fast, so those few behind can get away from them. And those at the rear, do a 180, and go the other way.
Thanks to the internet, and the extensive Facebook horse group pages we belong to, warnings are posted where the bees are located on a trail, and to be aware. Years ago, we carried Benadryl capsules along, to give to the horse if the got stung. Mix it with their sweet feed, and they'll lap it right up. Now, the have antihistamines in granular form, to give the horses, if they get stung.