You love Costco. I love Costco. Everyone in America loves Costco. The rotisserie chicken, the absurdly cheap hot dogs, the thrill of walking in for paper towels and walking out with a kayak and a 48-pack of muffins. But there is one day you should absolutely, categorically avoid setting foot in that warehouse. And if you’ve been going on this day, you already know in your gut that something is wrong. You just haven’t admitted it yet.
The day is Sunday. And it’s not even close.
Sunday Is the Worst Day to Shop at Costco, Period
According to multiple Costco employees and longtime members, Sunday is the single busiest day at most Costco warehouses. One employee put it bluntly on Reddit: “I work at Costco and Sunday is our busiest day of the week.” Friday and Saturday tied for second. But Sunday takes the crown every single week.
The cruel irony? Sunday is also the most convenient day for the majority of Costco’s core audience. Married couples who work Monday through Friday, families trying to stock up before the week starts, people who slept in Saturday and figured they’d “just go tomorrow.” Everyone has the same idea at the same time, and the result is a warehouse that feels like a sold-out concert with shopping carts.
What Actually Happens When You Go on Sunday
Let’s paint the picture. You pull into the parking lot and immediately realize you’ve made a mistake. Every spot within a quarter mile is taken. People are circling like vultures. You finally park what feels like a zip code away and walk in, only to find aisles so packed you can barely push your cart without bumping into someone else’s oversized flat of water bottles.
The produce section? Picked over. That specific Kirkland item you came for? Gone. The checkout lines stretch halfway back through the store. And then, once you finally pay, you get to stand in another line at the exit while someone checks your receipt. On a quiet Tuesday, that takes 10 seconds. On a Sunday, it can take 10 minutes.
Here’s one detail that stings: Costco often runs out of free samples on Sundays because so many people cycle through the store. That might sound minor, but come on. Samples are part of the experience. Missing out on a tiny cup of whatever new frozen appetizer they’re pushing is a real loss.
Saturday Isn’t Much Better
If Sunday is the worst, Saturday is a very close second. A 2024 survey by Drive Research found that Saturday has actually overtaken Sunday as the most popular overall grocery shopping day in recent years. At Costco specifically, the window between 10 a.m. and 2 p.m. on Saturdays is described as brutal. Add in the fact that Costco has shorter weekend hours, and you’re cramming even more people into a tighter window.
One writer from a major food site described weekend Costco trips as spending “an hour or two dodging shopping carts, waiting to check out, and lining up at the exit.” That’s not shopping. That’s an endurance event.
The Sneaky Bad Time Nobody Talks About
Weekends get all the hate, but there’s a sneaky bad time that catches people off guard: weekday evenings between 4 p.m. and 7 p.m. According to Costco insider and expert Markel, this window might actually surprise you as one of the worst. “These hours are packed with post-work shoppers, making the aisles busier and the checkout lines longer,” she says.
Think about it. You get off work at 5, figure you’ll swing by Costco on the way home, grab a few things, be in and out. So did a hundred other people at your location. The store goes from manageable to miserable in about 30 minutes. If you’re doing the after-work Costco run on a regular basis, you’re voluntarily signing up for one of the worst shopping experiences available.
Holidays Make Everything Worse
The days surrounding holidays are a special kind of chaos. The day before a holiday, especially one Costco closes for, is a madhouse. One writer showed up and found lines stretching all the way back to the bakery section. But here’s the part people don’t expect: the day AFTER a holiday is just as bad, sometimes worse. July 5th. The day after Thanksgiving. The day after Christmas. People are restocking after being shut out for a day or two, and they come in force.
Reddit users have described the days surrounding holidays as straight up “Madness.” Black Friday at Costco is also notoriously terrible, though at least you’d expect that one.
Why Monday Is a Trap
You might think Monday is a safe bet since the weekend is over. Not quite. Mondays at Costco can be deceptively busy because a lot of people shop on Monday to stock up for the week ahead. But there’s a bigger problem. Monday is restocking day at many Costco locations, which means shelves are still depleted from the weekend rush. That Kirkland product you wanted? It might not be back on the shelf yet. You’re fighting moderate crowds for a subpar selection. Not ideal.
Experienced Costco shoppers recommend skipping Monday entirely and waiting until Tuesday or Wednesday, when the restocking is complete and you actually have a full warehouse to choose from.
The Best Days and Times to Go Instead
So if Sunday is out, Saturday is out, weekday evenings are out, and Monday is a trap, when should you actually go? The consensus from employees, Costco influencers, and savings experts all points to the same answer: Tuesday through Thursday, ideally mid-morning to early afternoon.
Shannon Fong, who runs the popular Instagram account @costco.so.obsessed, prefers Tuesday or Wednesday mornings right before the store opens. Laura Lamb, CEO of Costco Hot Finds, shops Monday through Thursday between 1 and 3 p.m. when she wants maximum quiet. A self-identified Costco employee on Reddit put it plainly: “I can safely say Tuesday nights is our least busiest.”
If you want the insider’s pick for absolute best time, here it is: around 11 a.m. on a Tuesday or Wednesday. By then, the staff has restocked overnight, the morning rush of executive members and retirees has thinned out, and most sample stations are running. You get a full warehouse, short lines, and free snacks. That’s the Costco experience you deserve.
The Super Bowl Trick
Here’s a fun one. Multiple Costco insiders say the store is practically empty after kickoff on Super Bowl Sunday. The morning can be chaotic as people grab last-minute party supplies, but once the game starts (usually around 6:30 p.m. Eastern), the warehouse clears out fast. If you’re in one of the 32 NFL cities, this effect is even more dramatic.
One catch: Costco stores on the East Coast generally close before the game starts, so this trick works better if you’re in a Central or Pacific time zone. And during football season in general, Sunday afternoons after early games kick off tend to be quieter than usual. Turns out America watching football is great for your grocery shopping experience.
The Last Hour Before Closing Is Underrated
Google’s Popular Times data shows that the least busy time at most Costco locations is the last hour or so before closing on weekdays. That’s roughly 7 p.m. to 8:30 p.m., depending on your store. The after-work crowd has cleared out, and you basically have the place to yourself.
The tradeoff? You might miss out on rotisserie chickens. Those tend to sell out by evening, and the kitchen stops making them as closing approaches. If you can live without the $4.99 bird, late evening shopping is a genuinely peaceful experience. One Reddit commenter noted that the window from about 7 to 7:30 p.m. onward is when the store “empties out” on weeknights.
A Few More Tricks Worth Knowing
Show up 10 to 15 minutes before Costco officially opens. Warehouse doors are often rolled up a few minutes early, and you can grab a cart and get a head start. One shopper claimed to be completely done, including a food court hot dog, in 25 minutes using this strategy.
Shopping on a rainy day is another crowd-avoiding move. People are lazy about leaving the house when the weather is bad, which means fewer cars in the lot and more room in the aisles for you.
And finally, use the Google Maps Popular Times graph for your specific Costco. Just search “Costco” and your city, click on your store, and scroll down. It shows you hour by hour, day by day, how busy the store typically is. It’s free, it’s accurate, and it takes 30 seconds. There’s no reason to walk into a packed warehouse when you could have checked first.
The Bottom Line on When to Go
Sunday is the worst. Saturday is a close second. Weekday evenings from 4 to 7 p.m. are secretly terrible. Mondays have thin shelves. The days right before and after holidays are pandemonium.
Your best bet is Tuesday, Wednesday, or Thursday, sometime between 10 a.m. and 3 p.m. That’s when the shelves are full, the crowds are thin, and you can actually enjoy the experience of shopping at a store that sells both engagement rings and 5-pound bags of frozen shrimp. Go on the right day, at the right time, and Costco is wonderful. Go on Sunday, and you’ll question every life choice that brought you there.
