Generally yes, noindex the thin ones — hundreds of one-post tag pages dilute your crawl budget and can drag perceived site quality. But be surgical, not blanket:
- Noindex, follow the sparse tag archives (one or two posts). You keep the internal links flowing without asking Google to rank empty shells.
- Keep indexable any tag page that genuinely functions as a useful hub (10+ solid posts, real search demand for that term).
- Consider whether you even need that many tags. Consolidating 300 tags into 30 meaningful ones is often the better fix.
If you're on WordPress, our companion plugin can apply noindex in bulk and the audit will re-verify on the next run. Re-run /full-site-audit afterward to confirm the thin-page count drops.