Fortunately for me yellowjackets do not usually sting when away from the nest. Unlike honey bees, these insects have a smooth stinger and can sting repeatedly. It's not a wise move to crush a yellowjacket. A dying yellowjacket worker releases an alarm pheromone that alerts its nest mates. In just a few seconds, you could find yourself surrounded by angry wasps.
The number of workers in the nest will reach its highest population level in about another month (up to 5000 worker), then the numbers will begin to gradually decline until the onset of significant rainfall.
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