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We measure the spatially resolved recent star formation history (SFH) of M33using optical images taken with the Hubble Space Telescope as part of thePanchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER)survey. The area covered by the observations used in this analysis covers ade-projected area of $\sim$38 kpc$^{2}$ and extends to $\sim$3.5 and $\sim$2kpc from the center of M33 along the major and semi-major axes, respectively.We divide the PHATTER optical survey into 2005 regions that measure 24 arcsec,$\sim$100 pc, on a side and fit color magnitude diagrams for each regionindividually to measure the spatially resolved SFH of M33 within the PHATTERfootprint. There are significant fluctuations in the SFH on small spatialscales and also galaxy-wide scales that we measure back to about 630 Myr ago.We observe a more flocculent spiral structure in stellar populations youngerthan about 80 Myr, while the structure of the older stellar populations isdominated by two spiral arms. We also observe a bar in the center of M33, whichdominates at ages older than about 80 Myr. Finally, we find that the mean starformation rate (SFR) over the last 100 Myr within the PHATTER footprint is0.32$\pm$0.02 M$_{\odot}$ yr$^{-1}$. We measure a current SFR (over the last 10Myr) of 0.20$\pm$0.03 M$_{\odot}$ yr$^{-1}$. This SFR is slightly higher thanprevious measurements from broadband estimates, when scaled to account for thefraction of the D25 area covered by the PHATTER survey footprint.

The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) II. The Spatially Resolved Recent Star Formation History of M33