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How to Preserve Food Safely in a Root Cellar?

Optimal air temperature in a cellar is +0–5 °C (32–42 °F) and relative humidity should be at a level between 75% - 95%. In these conditions, different food products will remain preserved the longest and you can enjoy your summer harvest far into the winter.

A root cellar is a cool space underground, which is especially made for food preservation. By paying attention to the cellar’s ambient conditions, you will ensure that your food won’t spoil. A root cellar is an ecological option to store food, because it doesn’t require electricity to stay cool. You can store vegetables, potatoes, yams, drinks and other food products requiring cool storage.

The air in the cellar must be humid enough for the vegetables to stay in a good condition. Therefore relative humidity in a cellar can be higher than in living quarters. With environmental monitoring, you can ensure that the temperature and humidity are optimal for food storing. With an environmental sensor, you can improve the ventilation schedule, because trying to figure out the real temperature and humidity levels without any devices is really difficult.

The most common way of changing the conditions in a cellar is through ventilation. According to the outside temperature, you can either cool down or heat up the cellar by opening doors. With ventilation, you can also change the humidity inside the cellar. By monitoring the conditions in a cellar, you will notice how well the ventilation is working. If the temperature decreases too quickly, your ventilation may be too effective. Furthermore, with a small measuring device like the RuuviTag, you can find the subtle differences between different spaces in the cellar. Consequently with this knowledge, you can place more vulnerable products into the best, coldest spots.

Finnish RuuviTag is an excellent device to be used in a cellar. It measures air temperature and humidity accurately. In addition to these measurements, the device also measures air pressure and movement of the device. You can conveniently read these measurements on your mobile phone in real-time.

RuuviTag works with Bluetooth, so everytime you’re in the range of the device, you will be able to examine real-time information of the cellar. The application creates graphs of the past measurements, so you can examine the trends in the environmental conditions in the cellar. And, if you are not in the range of a RuuviTag, you can download up to 10 days of data from the device’s internal storage. Hence, you can examine the trends of the cellar even though you wouldn’t be in the range at all times.

You can set alerts to alert you if a certain threshold is exceeded. Alerts are especially handy when you are ventilating the cellar. You can set a threshold when you should close the door, and then act accordingly once you receive the alert.

With Ruuvi Gateway, you will receive measurement data even when not in the range of a RuuviTag. In addition, with Ruuvi Gateway, you will receive access to the Ruuvi web interface, in which you can examine graphs from up to 2 years. Also, you will receive alerts to your email anywhere, as long as you have a connection to the Internet.

Start preserving food ecologically and take your food safety to the next level with Ruuvi’s devices!

Buy Wireless Combined Thermometer and Hygrometer to Root Cellar
Know the conditions in your root cellar and store food safely and sustainably with RuuviTag

Buy Wireless Combined Thermometer and Hygrometer to Root Cellar

Know the conditions in your root cellar and store food safely and sustainably with RuuviTag


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RuuviTag is a Bluetooth sensor that monitors environmental conditions and sends the data directly to your mobile device. The Ruuvi Station mobile app allows you to view real-time accurate measurements and historical graphs. The app also provides customisable alerts to notify you of critical conditions, such as a melting freezer, excessively high bedroom temperatures that could disrupt sleep, or elevated humidity levels in your basement.

Onboard Sensors (4-in-1)

Temperature: °C, °F, K; typical accuracy ±0,2 °C @ 5-60 °C (±0.36 °F @ 41-140 °F).
Air humidity: RH-%, g/m3, dew point; typical accuracy ±3 RH-% @ 20…80 %. Range: 0-95 %.
Air pressure: Pa, hPa, mmHg, inHg; typical accuracy ±1 hPa. Range: 500-1155 hPa.
Motion: Movement counter. Counter is incremented when acceleration exceeds the threshold on any axis.

Operational Conditions

Operating temperature (with stock battery): -20 °C to +70 °C (-4 °F to 158 °F).
Absolute maximum operating temperature: -40 °C to +85 °C (-40 °F to +185 °F).
Housing: IP67, splash-proof, non-condensing location.
Battery: User-replaceable CR2477 (included). Supports extended operating temperature range battery CR2477T.
Battery lifespan: Estimated 12 to 24 months.
Bluetooth range: 5-20 meters (indoor), 20-100 meters (outdoor). The sensitivity of the receiving mobile device’s antenna, obstacles and wall materials affect the range. For increased range, use the Ruuvi Gateway router as a receiver.

App Features

Free and easy: User-friendly free app, signing in is optional.
Android and iOS.
Alerts: Configurable Bluetooth push alerts with customisable messages.
Real-time measurements: Track data in real time.
Historical data: Detailed historical graphs available for up to 10 days (offline).
History export: 10-day history export.
Dashboard: See all your sensors at a glance.
Personalise sensors: Use custom backgrounds and names.
Multilingual: Available in English, Finnish, Swedish, French, and German.


Integrations: Victron Energy, Home Assistant, Homey, and more.
Remote monitoring: When not within Bluetooth range, online remote monitoring is available with the Ruuvi Gateway and Ruuvi Cloud, both sold separately.

Technical Specifications

Data sheet: Download (pdf)
Read more info below:

You will find more use cases below