Radian 3QXT › fit in › Subaru Forester

Will the Diono Radian 3QXT fit in a 2019–2024 Subaru Forester?

Yes — the Diono Radian 3QXT fits a 2019–2024 Subaru Forester.
The Radian 3QXT is about 17" wide; the Forester's usable rear bench is about 51". It fits one rear position comfortably. Three across is tight (51" needed vs 51").

17"Radian 3QXT width

51"Forester rear bench

Tightthree across

★★★☆☆NHTSA Ease-of-Use

Check the Radian 3QXT on Amazon → All seats for a Forester

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What fits this Forester

One seat, rear position: Yes. The Radian 3QXT installs in an outboard rear position of a 2019–2024 Subaru Forester with room to spare.
Three across: Tight — three need ~51" against only ~51". A narrower seat is the better bet.
Modes this seat covers: rear-facing → forward-facing → booster.
LATCH: lower anchors up to 40 lb; the Forester has 2 lower-anchor positions.

ℹ️ Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip. The Radian 3QXT's width (Diono published spec (17 in)) and the Forester's rear-bench width (Subaru dimensions + owner measurements (approx)) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Diono Radian 3QXT fit in a 2019–2024 Subaru Forester?

Yes — the Diono Radian 3QXT (17" wide) fits a single rear seating position in a 2019–2024 Subaru Forester. Three across is tight — its rear bench is about 51" and three of these would need 51".

Can you fit three Radian 3QXTs across a Forester?

Probably not — three Radian 3QXTs need about 51" but the Forester's usable bench is only about 51". Consider a narrower seat — see our narrowest-seats guide.

Sources: seat ratings & modes — NHTSA (pulled 2026-06-17); dimensions — manufacturer specs and owner measurements. Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.