Growing & Harvest · 7 min read
Backyard greenhouse kits: size, frame and cover explained
How to pick a greenhouse kit that survives wind and snow, what size you actually need, and where to put it for the most light.
By WORKING ACRE Field Desk · Updated
Key takeaways
- Buy one size bigger than you think; everyone runs out of space.
- Polycarbonate panels insulate better than film or single glass.
- Anchoring matters as much as the frame.
/ What size greenhouse do you need?
| Footprint | Good for |
|---|---|
| 4 x 6 ft | Seed starting and a few tomatoes |
| 6 x 8 ft | Season extension for a family garden |
| 8 x 12 ft and up | Year-round growing, benches on both sides |
/ Covers compared
| Cover | Pros | Cons |
|---|---|---|
| PE film | Cheapest, light | Replace every 1-4 years |
| Twin-wall polycarbonate | Insulates, diffuses light, shatterproof | Costs more |
| Glass | Clear, long-lasting | Heavy, breaks, poor insulation |
/ Where to put it
- Long side facing south for the most winter sun
- Level ground with good drainage
- Close to water and, ideally, power
- Sheltered from the prevailing wind
/ Growing season checklist
| Season | Tasks |
|---|---|
| Late winter | Order seed, start seedlings indoors, service irrigation |
| Spring | Top up compost, set drip lines, harden off seedlings |
| Summer | Mulch, check timers, harvest often |
| Fall | Plant cover crops, drain lines before frost |
/ Frequently asked
Can a greenhouse kit handle snow?+
Choose a kit with a stated snow load and a peaked roof, and brush heavy snow off during storms.
Does a small greenhouse need ventilation?+
Yes. A roof vent or automatic vent opener prevents summer overheating, which kills more plants than cold.