12×24 Countryside Greenhouse – Three Forks, MT

This 12x24 Countryside Greenhouse in Three Forks, MT is a great fit for gardeners who want more room to grow without giving up comfort, airflow, or everyday functionality. With a spacious interior, built-in planter features, and automatic ventilation, it creates a practical setup for starting plants early, extending the growing season, and keeping everything easier to manage throughout the year.

The 7/12 roof pitch helps with heat release on warmer days and supports better snow shedding during Montana winters. A generous window package brings in plenty of natural light, while two large automatic gable vents help regulate airflow and temperature with less hands-on adjustment.

Inside, planter shelves and planter boxes line the walls, giving you organized growing space while keeping the center open for walking, potting, and extra planting setups. The 9-lite arched door adds character and brings in even more natural light at the entry.

Features include:

Size

• 12′ × 24′ footprint

Framing & Structure

• 16″ on-center framing for strength and long-term stability

Roof System

• 7/12 roof pitch to support airflow and help shed snow

Windows & Ventilation

• (13) 24″ × 27″ aluminum windows with screens for airflow and pest control

• (2) large gable-end automatic vents to release heat and regulate temperature automatically

Doors & Hardware

• 9-lite arched door window for added natural light and an inviting, classic look

Interior Workspace

• 12″ planter shelves for organized growing space along the walls

• 12″ planter boxes to support seed starting and planting while keeping the center open