Quick Answer: Costco’s 2026 greenhouse lineup centers on the Palram Canopia Harmony 6x8 with Starter Kit at $699.99 and a Yardistry wood-frame greenhouse around $799.99–$899.99, plus a larger Palram Balance 8-foot series (8x8 through 8x20) discounted $200–$500 off list. The catch: this is seasonal garden-department stock that rotates by warehouse and time of year, so a specific size isn’t guaranteed to be there when you’re ready to buy — which is exactly when the same Palram lineup on Amazon, available as a standing listing year-round, is worth checking first.
Costco greenhouses show up in searches for a simple reason: the warehouse chain genuinely does carry them, at real discounts, and buyers want to know before making a special trip or a membership decision just for one purchase. Here’s what’s actually in the 2026 lineup, what it costs, and when buying the equivalent kit on Amazon instead is the less frustrating path.
Costco greenhouse shopping by the numbers:
- $699.99 — Costco’s confirmed 2026 price for the Palram Canopia Harmony 6’ x 8’ Greenhouse with Starter Kit, per Costco’s own product listing. That undercuts the $744–$829 Home Depot has charged for the bare 6x8 Harmony kit (see our full Palram lineup comparison), though Costco’s price includes a bundled accessory starter kit Home Depot’s does not.
- 5% non-member surcharge — what Costco.com adds to your total if you check out online without a membership, per Costco’s own customer-service policy. On a $699.99 greenhouse that’s roughly $35 extra, still less than a $65 annual Gold Star membership for a one-time buyer, but worth factoring into the total price before you compare it to a non-membership retailer.
- $200–$500 off list — the discount range Costco has run on its larger Palram Balance 8-foot series (8x8 through 8x20), scaling with size, during recent promotional windows.
What’s actually in Costco’s 2026 greenhouse lineup
Three product lines make up most of what shows up at Costco warehouses and on Costco.com: the Palram Canopia Harmony 6x8 with Starter Kit, a Yardistry-branded wood-and-polycarbonate greenhouse running roughly $799.99–$899.99 depending on the current promotion, and a Palram Canopia Balance series in four sizes (8x8, 8x12, 8x16, 8x20) aimed at buyers with real yard space to fill. All three feature polycarbonate glazing panels, an aluminum or wood frame, and — on the Palram models — the same integrated gutter system and adjustable roof vents that show up across the rest of the Canopia by Palram range.
The Harmony is the one worth pausing on if you’ve read our Palram lineup breakdown: it’s the exact same clear-panel, maximum-light model covered there, not a Costco-exclusive variant. Costco’s $699.99 starter-kit bundle is a genuinely good price against Home Depot’s $744–$829 for the bare kit — the kind of gap worth knowing about if you happen to have a membership already and your local warehouse has it in stock.
The catch: seasonal stock, not a standing SKU
That last clause is the whole story. Costco’s greenhouse selection is a garden-department seasonal buy, not a year-round listing — a model in stock in early spring can be gone by summer, and not every warehouse location carries the same lineup or even carries greenhouses at all in a given season. Costco.com’s online listings shift the same way. If you’ve searched “Costco greenhouse” hoping to confirm a specific size is available today, the honest answer is: it depends entirely on the week and the warehouse, and there’s no reliable way to check remotely beyond calling ahead.
Canopia by Palram Harmony Greenhouse (Amazon)
- Identical crystal-clear 0.7mm polycarbonate roof and wall panels to the Costco-sold Harmony.
- Standing Amazon listing — no membership, no seasonal in-and-out stock, no non-member surcharge.
- Same aluminum frame, galvanized steel base, and 5-year frame-and-panel warranty.
- Standard Amazon return window instead of Costco's in-store-only process for an assembled structure.
If you’d rather not gamble on your local warehouse having the size you want this month, a free Kindle Unlimited trial is a good way to read through a season-extension or greenhouse-gardening guide while you compare listings and wait for the right kit to ship. Sponsored link — we may earn a fee if you sign up. No extra cost to you.
Costco vs. Amazon for a greenhouse purchase
| Costco | Amazon | |
|---|---|---|
| Availability | Seasonal, rotates by warehouse | Standing listing, year-round |
| Membership needed? | No — but 5% non-member surcharge online | No membership required |
| Harmony 6x8 price | $699.99 (with starter kit) | Varies by listing/season, check current price |
| Size range | ~6x7 to 8x20, no tabletop/mini | Tabletop minis through full walk-in kits |
| Returns | In-store, in-person for assembled structures | Standard Amazon return window |
Costco wins on price for buyers who already have a membership and whose local warehouse happens to have the Harmony or Balance series in stock right now. Amazon wins on certainty: the listing is there whenever you’re ready to order, in the size you actually want, without a membership decision or a surcharge attached to the purchase.
How to choose
- Check your local warehouse’s current stock before planning around it. Costco’s greenhouse selection is seasonal and location-dependent — don’t assume the model you saw online is in every warehouse.
- Factor in the 5% non-member surcharge if you’re not already a member. On a $699.99 greenhouse that’s roughly $35, which narrows the gap against a non-membership retailer more than it first appears to.
- Compare the Costco price against the same model elsewhere before buying. The Harmony’s $699.99 Costco price genuinely beats Home Depot’s $744–$829, so it’s worth checking — but confirm the comparison model, size, and included accessories match.
- Go with Amazon if you need a specific size on a timeline. A standing listing beats a seasonal maybe if your growing season doesn’t wait for warehouse restocking.
The bottom line
Costco does sell real, well-specced greenhouses — the Palram Harmony at $699.99 is a legitimately good price on the exact model covered in our Palram lineup guide — but the catch is availability, not quality. Stock rotates by season and by warehouse, online orders from non-members carry a 5% surcharge, and returns on an assembled structure mean an in-person warehouse trip. If your local Costco happens to have what you want in stock, it’s a good deal. If it doesn’t, the same Palram lineup — plus sizes Costco doesn’t carry at all, like tabletop and 4-tier minis — is a standing listing away on Amazon.
Shopping the full walk-in size range rather than just the Harmony? Our best greenhouse kit roundup and best small greenhouse guide both cover options in the compact end of the market Costco’s lineup skips entirely. Curious how the Harmony stacks up against the rest of the Canopia range? The full Palram comparison breaks down Hybrid, Mythos, Bella, and Glory alongside it.