With the Weenat Frost Sensor, say goodbye to sleepless nights and frost damage in your fields.

Spring frost is a major issue in viticulture and fruit growing.

In 2017 and 2019, spring frost was extremely severe and caused extensive damage:

• 80 to 100% of production was affected in Cognac, Saint‑Émilion, Médoc, and Listrac vineyards.
• In fruit growing, frost caused 90% yield loss in the Fougerolles area and 5,000 hectares affected in the southern Alps.

The Weenat frost sensor was designed to help winegrowers and orchard growers organize frost management.
Real‑time temperature monitoring in the field enables them to anticipate frost and protect yields more effectively.

Weenat designed a sensor specifically dedicated to frost.
It can be installed in sensitive areas, close to buds, for accurate, ultra‑local measurement.

The frost sensor is equipped with two separate probes, measuring two different temperatures:

1. Unsheltered dry temperature, which reflects the temperature actually felt by the buds, accounting for radiation, humidity, and wind — unlike standard sheltered sensors, which only measure ambient temperature.
2. Wet temperature, which measures the temperature felt when water is present (rain or dew). This is essential to assess evaporative frost and to start sprinkling systems used in vineyards and orchards.

• If the temperature is above 5 °C, the sensor’s data are updated every 15 minutes.
• When the wet temperature drops below 5 °C, the transmission frequency increases to every 5 minutes*.

* Every 5 minutes for LoRa network sensors, every 11 minutes for Sigfox network sensors.

Like the rain gauge, tensiometer, capacitive probe, Fertigation probe, and other Weenat sensors, the frost sensor is operational upon delivery — ready to use.

Install it in your most frost‑prone plots — usually valleys or flat areas where cold air pools.

Use the flexible clamps to fix your sensor to a post (trellis or dedicated pole), vertically, as close as possible to the lowest buds, since cold air is heavier and settles low.

Fill the water tank to ensure effective wet‑temperature measurement.

Connect to the Weenat platform to view your data from your computer, tablet, or mobile.

Tip: When not in use, lay the sensor down. It then enters standby mode to save the battery.

> See our video installation 

There are several ways to fight frost.
The activation threshold — the temperature at which you should start your systems — depends on the chosen method, crop stage, variety, and topography.

⚠️ These thresholds are indicative. Activating frost‑protection systems is delicate — contact your local technical advisors for guidance.

Unlike Weenat, some manufacturers display wet temperature based on a simplified calculation involving humidity and dry air.

This approach is problematic because:

• Data often come from a weather station 2 m above ground, not near your buds.
• It overestimates wet temperature, so alerts may not trigger even when frost occurs.
• It depends heavily on accurate humidity readings, but hygrometric sensors drift over time, reducing precision.

As a result, temperature differences greater than 1 °C can appear between both methods — and 1 °C can make all the difference for your crops.

Therefore, Weenat chose to directly measure wet temperature instead of relying on imprecise calculations.

That depends on your subscription:

• With Weenat Plus, you can receive alerts on 1 phone number.
• With Weenat Expert, your entire team can be alerted — up to 5 different phone numbers.