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We present detailed analysis of color-magnitude diagrams of NGC2403, obtainedfrom a deep (m<28) Hubble Space Telescope (HST) Wide Field Planetary Camera 2observation of the outer disk of NGC2403, supplemented by several shallow(m<26) HST Advanced Camera for Surveys fields. We derive the spatially resolvedstar formation history of NGC2403 out to 11 disk scale lengths. In the innerportions of the galaxy, we compare the recent star formation rates (SFRs) wederive from the resolved stars with those measured using GALEX FUV + Spitzer24-micron fluxes, finding excellent agreement between the methods. Ourmeasurements also show that the radial gradient in recent SFR mirror s the diskexponential profile to 11 scale lengths with no break, extending to SFRdensities a factor of 100 lower than those that can be measured with GALEX andSpitzer (2x10^{-6} M_{\sun} yr^{-1} kpc^{-2}). Furthermore, we find that thecumulative stellar mass of the disk was formed at similar times at all radii.We compare these characteristics of NGC2403 to those of its "morphologicaltwins," NGC300 and M33, showing that the structure and age distributions of theNGC2403 disk are more similar to those of the relatively isolated system NGC300than to those of the Local Group analog M33. We also discuss the environmentsand HI morphologies of these three nearby galaxies, comparing them tointegrated light studies of larger samples of more distant galaxy disks. Takentogether, the physical properties and evolutionary history of NGC2403 suggestthat the galaxy has had no close encounters with other M81 group members andmay be falling into the group for the first time.

The ACS Nearby Galaxy Survey Treasury XI. The Remarkably Undisturbed NGC 2403 Disk