Costco's May Garden Deals You Shouldn't Overlook In 2026

Whether you're stocking up on fresh linens for guests or trying to satisfy a craving for its iconic rotisserie chicken, it seems like there's always something worth snapping up at Costco (besides your weekly grocery essentials). As the weather warms in May and the outdoors beckon, it may be worth taking a peek at what kind of yard and garden product deals you can score on Costco's website. From storage sheds and gardening tools to fertilizer and seed assortments, there are plenty of online-only deals worth a second look this month.

One potential deal worth exploring comes through Costco from 80-year-old perennial and bulb supplier Longfield Gardens: a collection of 35 perennial Oriental lily (Lilium spp.) bulbs, now available at a $10 discount through 5/24/26. The assortment features pink and white blooms and includes 10 'Marlon' bulbs, 10 'Vestaro®' bulbs, 10 'Starfighter' bulbs, and five 'Corvara' bulbs. Best suited for USDA Hardiness Zones 4 through 9, caring for your Oriental lilies means giving them full sun, though they can also tolerate a bit of shade.

Make sure you inspect the bulbs upon arrival; Longfield Gardens will refund or replace bulbs that arrive damaged, and they have a one-year product guarantee. Some customers report the bulbs taking a couple of weeks to arrive, so plan accordingly. Also, multiple buyers reported that about a quarter of their bulbs did not sprout. Even the customers with these complaints report being happy with their purchase, though.

This Lifetime shed is quite highly rated, according to reviews on the Costco website. With its compact 8-foot by 12.5-foot by 7.67-foot size, it might be a good choice for a yard with limited space. Its double-walled High-Density Polyethylene (HDPE) construction is reinforced by an 18-gauge steel skeleton, which the company touts as both impact- and weather-resistant. One internal adjustable shelf and snap-in wall hooks offer flexible storage. If you like tinkering in a shed and plan to use it for more than just storage, this one features one "shatter-proof" window, as well as a skylight and screened vents. The door opening is quite large at 58.3 inches wide by 75.4 inches high, so you can easily store larger tools and recreational equipment; plus, the doors are lockable for security (though you'll have to supply your own padlock).

Valid through 5/17/26, the manufacturer's savings deal offers $300 off the full retail price of $1,499.99, meaning you can get the shed for only $1,199.99. An additional deal on a purchase of multiple sheds, valid through 5/26, is available through Costco Direct: you can save $100 on two sheds, $200 on three, $300 on four, and $400 on five or more. You can combine this deal with other offers, as well. This is a great deal if you want to ditch the pricey yard storage.

If you're in the market for cordless yard maintenance tools at an entry-level price point, you may want to take a look at the combination Greenworks 80V 730 CFM Blower & 17" String Trimmer package available at a $50 discount until 5/26/26. Now priced at $279.99, the trimmer and blower duo is well-reviewed by customers on the Costco site (though some do cite a wish for a second battery, as only one is included in the pack). The duo features a brushless motor, turbo mode, cruise control, and simple push-button start. Greenworks asserts that its trimmer will cover the equivalent of two miles of fence-line trimming on one charge and can deliver performance on par with a 30cc gas trimmer.

Remember: it's always a good idea to double-check reviews and specifications before buying, especially when it comes to bigger-ticket items like tools (no matter how deep the discount). Many Costco customers leave ratings and helpful comments detailing their experiences with the products they purchased. You can also check independent review sites like Wirecutter and Consumer Reports for additional, unbiased analyses.  Positive reviewers for this duo on Costco's site seem to agree that the cordless tools are lighter and less fussy than their old gas-powered tools. Some even express surprise that battery-powered tools can be so powerful.