Identify the thermometer type
A dial oven-safe food thermometer or a leave-in probe may remain in food. A handheld instant-read thermometer is normally inserted only when checking.
Gearjury may earn a commission when you buy through a retailer link.
Guide
Only an oven-safe or leave-in model may stay inside. Instant-read displays and wireless electronics must remain outside unless their instructions clearly say otherwise.

A dial oven-safe food thermometer or a leave-in probe may remain in food. A handheld instant-read thermometer is normally inserted only when checking.
Look for oven-safe or leave-in wording and a maximum temperature for the probe, cable and any in-oven transmitter. Do not infer safety from a metal probe.
With a wired system, the probe stays in the food while the cable exits the closed oven and the display remains outside. Route it exactly as the maker directs.
Radiant heat can exceed the conditions at the food and damage probes or cables. Respect separate limits for grilling, broiling and direct flame.
At the end of cooking, check a second spot with an appropriate thermometer because one fixed probe reports only its immediate location.
Common questions
Only the parts specifically rated for oven use can go inside. On many wired models, that means the probe and cable, not the display.
Usually not. Insert it for a check, take the reading and remove it unless the manufacturer explicitly permits continuous oven use.
Use only a heat-rated cable and route it as instructed, avoiding sharp pinches, heating elements and flame.
Check the model manual or official product page for leave-in use and limits covering every component exposed to heat.