Google Search Console shares their crawl behavior with you. To check it out, log on to Google Search Console and select a website. Head to Crawl > Crawl Stats and there you'll find out how often Google crawls your website. If you're fairly tech savvy, you can find out how often Google's crawls your website by analyzing your website's log files. It's worth noting that Google determines how often they should crawl your website using the crawl budget for your website.