Answer
No, hydrogen azide ($HN_{3}$) is not stable at any temperature.
Work Step by Step
$HN_{3}$ has a positive $\Delta G_{f}^{\circ}$, meaning that it spontaneously decomposes into $H_{2}$ and $N_{2}$ at room temperature. There are no temperatures at which $HN_{3}$ will be stable. $\Delta H_{f}$ is positive and $\Delta S_{f}$ is negative, so $\Delta G_{f}$ will always be negative.
