Boston logs 74 frost days a year to Seattle's 7 — Seattle wins by 67. Seattle also leads on hot days by 10.

Boston runs about $4,582/mo for a balanced lifestyle against Seattle's $4,312/mo — Seattle comes in $270 cheaper each month, roughly 6% less.

On mobility, Boston scores 3.8 vs Seattle's 3.4 (0–5 scale), with the biggest gap on public transit. Seattle still holds an edge on car efficiency.

Boston and Seattle score neck-and-neck on culture (4.0 vs 3.8, 0–5 scale).

Seattle's nature & outdoors score of 4.5 sits well above Boston's 4.0, with the biggest gap on mountain access. Boston still holds an edge on surfing & watersports.

Boston's safety score of 3.1 sits well above Seattle's 2.8, with the biggest gap on wildfire safety. Seattle still holds an edge on flooding safety.

Boston's career score of 4.6 sits well above Seattle's 4.2, with the biggest gap on startup ecosystem.

Boston and Seattle score neck-and-neck on social & community (3.4 vs 3.4, 0–5 scale).

On food & dining, Seattle scores 4.6 vs Boston's 4.2 (0–5 scale), with the biggest gap on vegan & vegetarian options.

Boston and Seattle score neck-and-neck on family (3.9 vs 4.0, 0–5 scale).

Boston and Seattle score neck-and-neck on healthcare (3.5 vs 3.5, 0–5 scale).

Boston averages 6.7 µg/m³ (good) PM2.5 annually versus Seattle's 6.4 µg/m³ (good) — Seattle breathes ~5% cleaner air (0.4 µg/m³ lower).

Who Thrives Here