If you're planning to drive to an Ahmedabad Metro station and park for the day, here's the honest state of what's publicly known.
Which stations have parking
Parking is available at a handful of peripheral stations, including Thaltej Gam, Vastral Gam, and APMC. These tend to be the stations at or near the ends of lines — the kind of spot you'd drive to and then ride in from, rather than a central station you'd pass through.
What it costs
We couldn't find a published fee schedule for GMRC station parking anywhere — no rate card on the official site, no signage transcription, nothing reliable enough to print here as fact. If you're planning to park, budget for it being a paid lot (most Indian metro systems charge something nominal) but confirm the actual rate with station staff or signage when you arrive, since we can't responsibly guess a number.
What to do instead
If certainty matters — say, you're commuting daily and need to budget for it — it's worth a quick call to GMRC or a visit to the station before committing to driving in. For an occasional rider, the safest plan is simply to bring some cash and expect a modest fee, the same as you would at most Indian metro park-and-ride lots.
Bottom line
Thaltej Gam, Vastral Gam, and APMC are your best bets for station parking on this network. Rates aren't published anywhere we could verify, so treat free as unlikely and confirm on arrival rather than assuming a number.