I love when I stumble upon these. Yellow garden spiders may look threatening, but they are harmless and not aggressive towards humans. They can bite humans but will only do so if threatened (handled, stepped on, sat on, etc.) Females are the large, colorful ones we see in gardens and fields. Males are smaller and nondescript. They are native to the U.S. and are beneficial to our landscape, if not intimidating-looking.
They sure look intimidating! I always leave spiders alone! Free pest control.