Your sitemap should update whenever pages are added, removed, or meaningfully changed — not on a fixed calendar schedule. In practice, that means automating regeneration rather than manually updating a static file, so the sitemap is always a current, accurate reflection of your site.
Does Updating Your Sitemap Make Google Crawl Faster?
No — this is the most common misconception. Resubmitting or updating your sitemap doesn't force Google to crawl your site more frequently. Google decides crawl rate and priority on its own, based on signals like site authority, historical change frequency, and server response health. Your sitemap is an input to that decision, not a lever you pull directly.
What an accurate, up-to-date sitemap does is make sure Google has a correct picture of what exists on your site and when it last changed — which helps it prioritize crawling more effectively over time, even if it doesn't change the crawl rate for any single request.
The Role of <lastmod>
The <lastmod> tag tells search engines when a URL last changed. Google uses it as a signal — but only if it trusts it. If every URL in your sitemap shows today's date on every single deploy, regardless of whether the content actually changed, Google will notice the pattern and start ignoring <lastmod> entirely for your site. Only update the timestamp when the page content meaningfully changes.
Recommended Update Cadence by Site Type
| Site type | Suggested regeneration |
|---|---|
| News / publishing | Real-time or on every publish |
| E-commerce | Daily, or on every product change |
| Active blog | Weekly, or on every new post |
| SaaS marketing site | Weekly to monthly |
| Small static / brochure site | On deploy, or whenever a page is added or removed |
Static vs Dynamic Sitemap Generation
There are two common approaches:
- Build-time generation — the sitemap is regenerated every time you deploy. Works well for sites where content changes are tied to deployments (most static sites, many SaaS marketing sites).
- On-demand / scheduled generation — a separate process crawls or queries your content and regenerates the sitemap on a schedule (hourly, daily), independent of deploys. Better for content that changes without a deploy — CMS-driven blogs, e-commerce catalogs, user-generated content.
Either way, the goal is the same: never hand-edit a sitemap file. Manual updates are the most common cause of stale sitemaps — pages get added to the site and forgotten in the sitemap, or removed pages linger in it long after they return 404.
A Practical Setup
If you don't already have automated generation, the simplest reliable setup is: regenerate on a schedule that matches how often your content actually changes, and pair it with periodic health checks. A sitemap that's current but full of broken links is only half the job — auto-refresh combined with a health check catches both staleness and breakage in the same pass.