Can you day-trip to Rabat from Casablanca?

Yes, and it is one of the simplest day trips in Morocco. Casablanca and Rabat are close neighbours on the country's busiest rail corridor, and trains run between them very frequently throughout the day. The journey is roughly an hour, city centre to city centre, with no car or driver required — you just walk into Casa-Port or Casa-Voyageurs station, buy a ticket, and go.

For a smooth day trip I tell clients to take a mid-morning train, walk straight to the Kasbah of the Udayas, then loop through the medina, over to the Hassan Tower and Mausoleum, and finish at the Chellah before heading back. Everything in Rabat's historic core is close together and taxis are cheap for the few longer hops, so you can see the headline sights in a single relaxed day and still make an evening train back to Casablanca. Trains run late, so you are not under huge pressure to rush.

That said, I will gently push you toward the better version: spend a night. Rabat's charm is its slowness — the riverside cafés, the sunset over the ocean, the unhurried medina — and a day trip forces you to consume it efficiently, which is slightly against its nature. If your itinerary has any flexibility, a Casablanca-then-Rabat overnight before continuing north to Tangier or east to Fes is a lovely, low-stress sequence.

One practical note: build your plan around the train, not a rental car. Driving and parking in both city centres is a hassle, the rail link is fast and cheap, and it drops you within walking distance of the sights. Keep the car for the parts of Morocco where you actually need one — the mountains and the desert.