Give yourself ample time to plan and prepare for the yard sale. If you’re hosting one with multiple people, it might take longer to get everyone on the same page.
Check the weather. Then check it again. Plan for a day that won’t rain, and make sure it’s not going to be too hot.
Also, don’t plan a yard sale on a major holiday as people will probably be out of town. Or they’ll have plans instead of just wandering around town for a yard sale. Not that there’s anything wrong with wandering around town, looking for a yard sale.
Definitely host your yard sale on a weekend since that’s when most people aren’t working. Ideally, host it on Saturday and Sunday to get the most traffic. More traffic = more sales.
Start early. Like 7 AM early. Early birds walking around their neighborhood love to poke around yard sales. Ideally you’ll be open all day. Even more ideally, you’ll have friends that can join you so you can work in shifts. Basically you’ll want to camp out on your lawn all day to be available to the most amount of people.
Pro Tip: Know when people get paid, and plan accordingly. If most of the people in your neighborhood work for companies that pay them every other Friday, host your yard sale the following weekend.