An old farmer told me my fence posts were set too shallow, and he was right
About 5 years back, I was putting up a new section of fence on my property near Springfield. An older guy from down the road walked over, looked at my work, and just said 'You're gonna be resetting those posts come spring.' I had dug them about 18 inches deep, which I thought was plenty for a horse fence. He tapped the ground with his boot and told me in this clay soil, I needed at least 30 inches or the frost would push them right up. I grumbled about it but ended up redigging all 12 holes that weekend. That next winter was brutal, temps dropped to -10 for a week straight. Come spring, every post I set to his depth was rock solid, but two of my neighbor's posts that he did himself had lifted a good 4 inches. Now I always check the frost line before I dig anything, and I don't argue with local knowledge anymore. Has anyone else had a random passerby give you advice that ended up saving you a ton of rework?