Four-Season Greenhouse Kits for Your Climate and Crops
A four-season greenhouse can keep fresh greens close at hand through winter, shelter tender plants between seasons, and offer a warm, living place to step into when the garden outside is dormant. Growing Spaces offers six Growing Dome® sizes to accommodate the local climate, the crops you want to grow, and the way you imagine using the space.
The geodesic frame and 16 mm five-wall polycarbonate work with reflective north-wall insulation, an above-ground pond, ventilation, shade cloth, and undersoil air circulation as one climate-management system. Supplemental heat, light, or cooling can be added when local conditions and the growing goal call for it.
A Growing Dome size for the way you want to use it
Dome size shapes how much room there is for beds, paths, a work surface or chair, and how the greenhouse feels when more than one person is inside. It also influences the foundation, installation scope, enclosed air volume, and any heating or cooling equipment.
Some people want a compact greenhouse devoted almost entirely to food. Others picture room for propagation, generous paths, or a pond-side place to sit with a cup of coffee. You do not need to solve the circular floor plan before choosing a size.
The six models give households, schools, and community programs room to balance growing area with comfortable circulation. Preset layouts and custom interior design options can help turn the available space into a workable garden.
The Growing Dome Greenhouse Guide shows all six models side by side, while the greenhouse configurator helps narrow the range around the way you want to grow.
What four-season growing can look like
“Year-round” can mean harvesting spinach in January, keeping a citrus tree alive, or producing tomatoes through the shortest days. These are all four-season goals, but they do not call for the same indoor conditions.
Cold-tolerant crops can make productive use of winter light without holding the dome at warm-season temperatures. Growth naturally slows during the darkest weeks, so winter harvests follow a different rhythm from summer production.
Tender plants need more protection. Keeping citrus alive, maintaining dormancy, and harvesting fruiting crops through winter are separate goals, each with its own needs for heat, light, monitoring, and backup power.
A school or community greenhouse introduces another rhythm. The dome may need to support classes, volunteers, or food production across a calendar that includes weekends, holidays, and periods when fewer people are present.
The winter greenhouse gardening guide explores season-appropriate crops and the practical routines of caring for them through cold months.
Are Growing Domes 4-Season or Year-Round Greenhouse Kits?
Growing Dome greenhouse kits are designed for use across all four seasons, but “four-season” does not describe one fixed indoor climate. For one grower, it may mean a protected winter harvest; for another, warmer conditions for citrus or fruiting crops. The structure, passive systems, crop choices, and any active equipment need to work together for that particular goal.
| Four-season goal | Inside the greenhouse | What supports it |
|---|---|---|
Winter-ready structure | The greenhouse, foundation, and anchors are configured for the property and applicable wind and snow requirements. | The final configuration reflects size-specific structural information and applicable local requirements. |
Temperature moderation | Passive systems capture, retain, and redistribute some solar warmth to help moderate temperature swings. | Winter sunlight, exposure, dome size, and crop temperature needs all affect what those systems can provide. |
Cold-tolerant winter crops | Hardy greens, roots, and herbs can remain useful through short, cold days, though winter growth is slower. | A season-appropriate crop mix, monitoring, and occasional added protection may be enough in some climates. |
Warm-season winter growing | Tender and fruiting crops need warmer conditions and sufficient light to keep producing. | Supplemental heat or light, monitoring, backup power, and operating cost may become part of the project. |
What matters beyond the hardiness zone
Two properties in the same hardiness zone can behave very differently in winter. A sunny, sheltered location gives a greenhouse a better starting point than one exposed to wind or shaded by trees, buildings, or terrain.
Winter sunlight and day length, typical low temperatures, elevation, wind and snow, and the conditions your plants need are more informative than the zone alone. Frost protection and winter tomato production call for very different indoor conditions.
Drainage, grade, utilities, fuel options, and delivery access also shape what is practical. You do not need to resolve all of these before speaking with us. What you already know is enough to begin comparing size, structure, and climate options.
The deep-winter greenhouse comparison looks at another cold-climate design approach. Current structural information is in the weather-resistant greenhouse guide, and the site-selection guide covers sunlight, drainage, access, and other property questions in more depth.
15' Growing Dome Small Greenhouse Kit
18' Growing Dome Greenhouse Kit
22' Growing Dome Greenhouse Kit
26' Growing Dome Greenhouse Kit
Four seasons at our Pagosa Springs domes
At our Pagosa Springs demonstration campus, four-season growing does not mean recreating summer all year. We grow season-appropriate crops year-round with minimal supplemental heat and no supplemental lighting. Once nightly freezes begin, we disable the automatic fans and vents until daytime temperatures start rising again.
A geodesic frame distributes loads through interconnected triangles. Its rounded exterior presents less of a broad face to wind, and snow can shed from the sloping panels. 16 mm five-wall polycarbonate encloses the garden and diffuses incoming sunlight.
The reflective north-wall insulation redirects radiant energy toward the growing area. During sunny periods, the above-ground pond absorbs warmth and releases some of it as the dome cools, helping moderate temperature swings.
Heat-activated vent openers support passive air exchange as the greenhouse warms. The standard undersoil system moves air from the pond area through owner-supplied 4-inch corrugated pipe beneath the perimeter bed.
Three versions of a four-season Growing Dome
One greenhouse holds tropical fruit through a Colorado winter. Another rises above a Michigan root cellar, with a wood stove below. In Nebraska, a family chose the 22-foot size after walking through all six demonstration domes and imagining the beds they wanted at home.
Heat, light, and cooling in a year-round greenhouse
A hardy winter garden and a greenhouse full of fruiting tomatoes place very different demands on the climate system. Supplemental heat becomes more likely as the desired indoor temperature rises above what winter sun, thermal mass, and insulation can support.
Heat and light serve separate purposes. Heating depends on outdoor conditions, dome size, crop sensitivity, available fuel or power, and the consequences of an outage. Grow lights become relevant when short days, cloud cover, crop type, or continued winter production leave natural light short of the goal.
During hot weeks, shade cloth and passive ventilation may be enough in some climates; other locations benefit from powered air movement or cooling. Temperature and humidity readings make seasonal adjustments less guesswork.
Fuel or electricity, routine checks, maintenance, seasonal adjustments, and backup systems all contribute to the operating cost.
The Growing Spaces tools and calculators provide useful early estimates, and a Growing Dome Advisor can help narrow the equipment options for the project.
A foundation suited to the property and winter conditions
The frame, anchors, and foundation work as one structural assembly, and the right foundation depends on the property and project. Slope, soil, frost depth, drainage, intended use, and local wind and snow requirements can all affect the choice.
Trees or terrain may cast long December shadows, while delivery and construction need a workable route to the build area. Water and power are easiest to consider while the foundation and interior are still taking shape.
A local authority or project engineer may require a particular foundation or supporting documentation. Growing Spaces offers several installation paths, including owner-built and locally contracted projects, assisted installation, and eligible builds completed by a Growing Spaces crew. Availability and scope vary by project.
The foundation guide compares the main options. The building-permit guide outlines common documentation questions. The installation options page summarizes the available ways to build.
Estimate Heating and Cooling Needs
Enter your ZIP code and choose a growing goal in the greenhouse climate calculator. Use the result for early heating and cooling planning, then confirm project-specific equipment and plan supplemental lighting separately.
What helps us narrow the options
- How you want to use it: favorite crops, winter harvests, tender plants, time spent in the greenhouse, and whether it will serve a household, school, or community.
- How the space should feel: generous growing beds, wider paths, a work area, a place to sit, or room for a group to move comfortably.
- Challenges on your mind: cold, heat, short winter days, wind, snow, power outages, accessibility, or an unusually exposed location.
- What you already know: the approximate location and any facts about sunlight, utilities, access, or local requirements that are already known.
- Support you may want: help comparing sizes, interior layouts, installation paths, freight, owner-supplied materials, or the cost of active climate systems.
Resources for the rest of the project
More detail is available for each part of the project, from foundations and installation to interiors and planning tools.
Questions about year-round greenhouse kits
Questions shift between a mountain winter and a hot, humid summer, and between kale and citrus.
Tell us what you want the greenhouse to make possible
Share what you hope to grow, how you imagine using the space, and which challenges feel most relevant. You do not need a finished layout or technical plan. The configurator is available if you want to explore sizes and options on your own. A Growing Dome Advisor can also help narrow the configuration, interior approach, and installation path around what you are trying to accomplish.
