Coverage analysis
What 30 minutes cycling covers in Seattle.
Seattle is hemmed in by Puget Sound to the west and Lake Washington to the east, with only two bridges (520 and I-90) connecting the city to the Eastside. Drive-time isochrones here are the most lake-and-water-distorted of any major US metro.
At 30 minutes by bike, the Seattle cycling isochrone captures the city-wide cycling catchment — a zone where cycling trips are purposeful — riders cross neighbourhood boundaries for specific destinations. Unlike a flat radius circle, the real cycling-network polygon follows Seattle's actual bike lanes, greenways, and low-traffic streets — reaching further along protected corridors while contracting where motorways, rail yards, and rivers lack cycle crossings.
Coverage area at 30 minutes cycling: ≈ 30–60 km². Common applications for this zone include bike-share service area design, brewery and urban recreation catchment analysis, bike shop trade area planning.
The city-level population of 737,255 and a median household income of $102,486 give a sense of Seattle's economic density, but the figure that matters for cycling catchment analysis is the population inside the polygon — not the city as a whole. That number shifts significantly depending on whether your origin is in a dense urban core or a lower-density suburban corridor. Use the tool above to set your actual candidate location, then generate the isochrone to see the real cycling catchment.