Privacy, sources & disclaimer

Independent, experimental project. Foliage stages, peak-date windows, and trip scores are estimates for planning only. They are not live observations or verified conditions. Always check recent photos, official weather warnings, trail access, opening hours and park safety advice before travelling.

What the site does

folha. is a non-commercial guide to places where autumn foliage may be visible in Portugal. Seasonal timing, weather data and scoring are approximate. Coverage is curated, not exhaustive. Map markers may represent general areas rather than trailheads or entrances. The satellite pilot compares actual cloud-screened Sentinel-2 vegetation measurements at two forests with summer reference images. These measurements are experimental and do not verify autumn leaf colors or the best date to visit.

Privacy and local storage

The site does not operate accounts, collect form submissions, use ad pixels, or run its own analytics. It uses your browser’s local storage to remember your language preference and temporarily cache recent weather data (typically up to one hour). You can clear this using your browser’s site-data controls.

Your browser contacts third-party services to display the site: GitHub Pages (hosting), GitHub Raw (fresh satellite analysis data), Open-Meteo (weather), OpenFreeMap (map data), and Google Fonts / a JavaScript CDN (display assets). These providers may receive standard request information such as your IP address. GitHub says it logs visitor IP addresses for security. Visiting external map, satellite or navigation links opens other services with their own privacy terms. This page does not claim to control those providers' practices.

No optional advertising or analytics cookies are intentionally set by folha. If analytics or other non-essential tracking is introduced, this policy and any required consent mechanism must be updated before enabling it.

Data sources & credits

Questions or corrections

To report incorrect information, outdated destinations, accessibility issues or privacy questions, open a GitHub issue. This is a public tracker: do not post sensitive personal information. Last updated: October 2026.