A seasonal winterization checklist for commercial greenhouses says the task is not only to keep plants warm. It is also to protect crop quality, reduce downtime, control energy use and ensure that structures and environmental systems can handle snow, ice, wind and temperature swings.
The guidance calls for a thorough inspection before severe weather arrives so growers can fix problems before they disrupt production. Structural checks should cover framing connections, doors, vents, glazing, polyethylene coverings, seals and exterior components. Operators should look especially for paths for air or moisture, including worn weather stripping, aging seals, loose panels and gaps around doors and vents.
For polyethylene-covered houses, the checklist advises checking for punctures, tears, looseness and deterioration. Inflated double-poly systems should also be tested to confirm the inflation system works. Because snow and wind requirements vary by location and design, growers should maintain components according to the building’s intended design and local requirements. If structural condition or winter loading is uncertain, the article says to involve the manufacturer or a qualified professional rather than wait for a major storm.
Heating and controls
The checklist treats heating as an operational risk, not just a cost center. A heating fault in summer might be a nuisance; the same fault during a deep winter cold spell can turn into an operational emergency. Before temperatures fall, growers should inspect the full heating system and complete manufacturer-recommended service. Boilers, unit heaters, radiant systems, pumps, fans, thermostats, sensors and distribution equipment should all operate as intended.
Its heating-related checks include visible wear or operating problems, thermostat and sensor operation, circulation and horizontal airflow fans, vent and louver movement, control systems, alarms and backups, fuel supply or delivery arrangements, and generator or emergency power procedures.
Environmental controls also need attention because winter management is rarely about heating alone. Humidity, airflow, ventilation and temperature interact. Reducing ventilation too aggressively to conserve heat can lead to humidity problems, condensation and uneven growing conditions. The stated goal is to maintain crop requirements while operating the greenhouse as efficiently as practical.
Envelope, curtains and airflow
Heating is often a large winter operating demand, so the checklist advises finding small efficiency problems early. The building envelope should be inspected for escaping conditioned air through doors that do not close properly, worn seals, gaps around penetrations, damaged glazing and poorly maintained vents.
Where retractable energy curtains or thermal screens are installed, growers should check curtain material, drive systems, cables, motors, sensors and controls before nightly use. Some growers add inflated polyethylene over polycarbonate or glass sidewalls and gable ends in fall for extra insulation; the article says this seasonal approach can help where it suits the greenhouse design and operation.
Equipment and storage areas should not interfere with airflow or heat distribution. A heating system can run correctly yet produce uneven temperatures if benches, stored materials, equipment or temporary barriers block air movement. The checklist also recommends reviewing whether the greenhouse is still operated as originally designed, because production layouts, crops, benches, structures and environmental equipment change over time.
Storm readiness
A winter plan should go beyond routine maintenance. Teams should know who monitors snow accumulation, heating equipment, alarms, backup power and vents during storms or extreme cold. Gutters, drainage paths and areas around the greenhouse should be kept clear where practical so melting snow and ice can drain, and doors and emergency exits should remain accessible.
In snow-prone climates, the article suggests dedicated gutter snow-melt piping installed beneath gutters can operate as a separate heating zone and be activated only when snow or ice is present. By supplying heat where melting is needed, this may let growers keep energy curtains or blackout systems closed instead of opening them to let greenhouse heat reach the roof and gutters, helping preserve the insulating layer while managing accumulation.
Snow removal should follow recommendations for the specific greenhouse design. Improper removal can damage coverings or structural components, and unnecessary activity on or around a snow-loaded greenhouse can create safety risks. Operators should understand the snow and wind conditions their structure was designed for and have a response plan for unusual weather.