Poplar › fit in › Subaru Ascent
Will the Britax Poplar fit in a 2019–2024 Subaru Ascent?
Yes — the Britax Poplar fits a 2019–2024 Subaru Ascent.
The Poplar is about 18.5" wide; the Ascent's usable rear bench is about 53". It fits one rear position comfortably. Three across is tight (55.5" needed vs 53").
The Poplar is about 18.5" wide; the Ascent's usable rear bench is about 53". It fits one rear position comfortably. Three across is tight (55.5" needed vs 53").
18.5"Poplar width
53"Ascent rear bench
Tightthree across
★★★★☆NHTSA Ease-of-Use
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What fits this Ascent
- One seat, rear position: Yes. The Poplar installs in an outboard rear position of a 2019–2024 Subaru Ascent with room to spare.
- Three across: Tight — three need ~55.5" against only ~53". A narrower seat is the better bet.
- Modes this seat covers: rear-facing → forward-facing.
- LATCH: lower anchors up to 40 lb; the Ascent 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 Poplar's width (Britax published spec) and the Ascent's rear-bench width (Typical for 3-row suv — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.
Common questions
Will the Britax Poplar fit in a 2019–2024 Subaru Ascent?
Yes — the Britax Poplar (18.5" wide) fits a single rear seating position in a 2019–2024 Subaru Ascent. Three across is tight — its rear bench is about 53" and three of these would need 55.5".
Can you fit three Poplars across a Ascent?
Probably not — three Poplars need about 55.5" but the Ascent's usable bench is only about 53". Consider a narrower seat — see our narrowest-seats guide.
Sources: seat ratings & modes — NHTSA (pulled 2026-06-18); 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.