  We measure the spatially resolved recent star formation history (SFH) of M33
using optical images taken with the Hubble Space Telescope as part of the
Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER)
survey. The area covered by the observations used in this analysis covers a
de-projected area of $\sim$38 kpc$^{2}$ and extends to $\sim$3.5 and $\sim$2
kpc 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$100 pc, on a side and fit color magnitude diagrams for each region
individually to measure the spatially resolved SFH of M33 within the PHATTER
footprint. There are significant fluctuations in the SFH on small spatial
scales and also galaxy-wide scales that we measure back to about 630 Myr ago.
We observe a more flocculent spiral structure in stellar populations younger
than about 80 Myr, while the structure of the older stellar populations is
dominated by two spiral arms. We also observe a bar in the center of M33, which
dominates at ages older than about 80 Myr. Finally, we find that the mean star
formation rate (SFR) over the last 100 Myr within the PHATTER footprint is
0.32$\pm$0.02 M$_{\odot}$ yr$^{-1}$. We measure a current SFR (over the last 10
Myr) of 0.20$\pm$0.03 M$_{\odot}$ yr$^{-1}$. This SFR is slightly higher than
previous measurements from broadband estimates, when scaled to account for the
fraction of the D25 area covered by the PHATTER survey footprint.
