The Altrac Frost Fan Controller auto-starts wind machines based on local conditions and lets growers monitor and control them from their phone, tablet or computer. It installs on virtually any wind machine and works with your existing autostart controller or thermostat.

Frost events rarely happen at convenient times. Altrac tracks air temperature, engine status, RPM, battery voltage, fuel level and runtime, and sends alerts by text, email or phone call the moment something isn't right. Growers no longer need late-night field checks to confirm every machine is running, and crews only head out when they're really needed.

After the season, Altrac's reporting shows how each machine performed, from runtime after sunrise to early signs of engine problems, so growers can cut fuel costs, plan maintenance and improve their frost strategy year after year.

Altrac was founded in 2018 to solve a simple problem: growers were spending frost nights driving between wind machines just to check they had started. We set out to build cellular control that works with any equipment, is simple to install, and is easy to use.

From the start, we've worked closely with the manufacturers and dealers who build and service wind machines. Those partnerships keep our technology grounded in real field conditions and mean growers have local support when they need it. In 2020 we partnered with Semios to pair their in-canopy climate sensors with our frost fan automation. Growers liked the results, and in 2021 Altrac joined the Semios Group.

Altrac is a Smartfield® product. Smartfield is the Semios Group’s family of in-field technology: the tools that show growers what’s happening in the field and help them act on it. It includes Semios pest, weather, frost and water monitoring, and Altrac wind machine control.

Smartfield is built around one idea: growers should be able to see risk building in the field and respond before it costs them a crop. Frost shows why this matters. Knowing that conditions are turning is only half the job. The other half is getting every wind machine running and confirming that it is. Bringing sensing and control together under one Smartfield brand is how the Semios Group is working toward a simpler, more complete view of in-field risk across the season.

Smartfield is part of the wider Semios Group, alongside Agworld for farm planning and record keeping and Greenbook for crop-input data. The group is a global digital ag-solutions group delivering complete, simplified farm management, with more than 200 team members worldwide and a footprint of over 100 million managed acres.

Across the group, the mission is the same: to make farming operations more efficient, sustainable and profitable by connecting the essential elements of modern agriculture, from crop protection and water management to frost control, automation and compliance. Recognized in the Global Cleantech 100 and Thrive Top 50, the Semios Group is driving the next generation of digital agriculture, helping the global farming community manage resources, reduce risk and operate with confidence season after season.