Costco's website experiences outages more often than you'd expect for a retailer of that scale, primarily during major sales events like Black Friday, Boxing Day, or flash promotions when traffic spikes overwhelm their infrastructure. Their checkout system in particular is notorious for bottlenecks during high-demand periods. If you're seeing error messages, blank pages, or infinite loading screens, you're likely hitting either a genuine outage or a localized issue on your end. Start by checking DownDetector or searching Twitter for "Costco website down" to see if others are reporting the same problem. If it's a widespread outage, there's nothing you can do but wait. Costco typically resolves these within 30 minutes to 2 hours during peak times. If the issue appears isolated to you, try these steps in order: clear your browser cache and cookies, test in an incognito window, switch browsers entirely, disable VPN or ad blockers that might interfere with their security protocols, or try accessing from your phone on cellular data instead of WiFi. Costco runs separate domains for different countries (Costco.ca for Canada, Costco.com for the US), and occasionally one will be down while the other works fine. Canadian users should verify they're on the .ca domain if they're trying to access local warehouse inventory or Canadian-specific deals. From a web design perspective, Costco's infrastructure is surprisingly outdated for a company doing billions in online revenue. They've been slow to adopt modern CDN strategies and elastic server scaling that would prevent most of these outages. When we build e-commerce sites at Ottawa SEO, we implement load balancing and caching layers specifically to avoid the kind of traffic-choke scenarios Costco regularly experiences. For a membership-based retailer where checkout abandonment directly impacts revenue, these outages likely cost them millions annually. If you're repeatedly unable to access the site during normal hours, contact their support line at 1-800-463-3783 in Canada, as account-specific issues can sometimes block access without clear error messages.