  We report the characterization of the FBK ``NUV-HD-Cryo'' SiPMs at 10 K
temperature. With 405 nm and 530 nm light, we measured the photo-detection
efficiency (PDE) at the bias voltages between 6 to 11 V overvoltage (OV). The
PDE reaches $\sim$ 40\% for 405 nm and 530 nm light with a bias voltage of OV 9
V. A bias voltage higher than 9 V leads to a slightly greater PDE. We also
measured the SiPMs' PDE at room temperature (RT). The results are consistent
with the measurements on the similar model SiPMs by other groups. The I-V curve
of the SiPMs differs significantly from the conventional one measured at RT.
The dark current ratio (DCR) is tested to be $\sim$ 1 Hz for the 92 mm$^2$
SiPMs, or 0.01 Hz/mm$^2$, which is $\sim$ 7 orders lower than the ratio tested
at RT. The SiPMs' performance at 10 K demonstrated that it could be equipped on
a liquid helium detector as the photosensor to search for rare events,
including but not limited to dark matter searches.

Instrumentation and Detectors;High Energy Physics - Experiment