What type of business is Blackburn's Greenhouse?

Blackburn's Greenhouse is classified as a dealer in Portage, WI.

What USDA growing zone is Blackburn's Greenhouse in?

Blackburn's Greenhouse (ZIP 53901) is in USDA hardiness zone 5a, with an average minimum winter temperature of -20°F.

Wholesale Grower Dealer

Blackburn's Greenhouse

Name: Blackburn's Greenhouse
Address: N9371 County Road Aa, Portage, WI, 53901, US
Telephone: (608) 586-5985

N9371 County Road Aa, Portage, WI 53901

Business information on this page (including hours, address, phone number, rating, and licence status) is provided for reference only. Some fields carry their own as-of date; others may be older than they appear. Contact the business directly to confirm current information before visiting or purchasing. See our full Disclaimer.

Licence record on file, unconfirmed Matched WI's registry as of 2026-08-04 (96 days ago), too old for us to state this business is currently licensed. See the source registry to confirm current status.

Call (608) 586-5985 Directions

Before you visit

Blackburn's Greenhouse is listed as a wholesale grower. Many wholesale growers sell mainly to landscapers and garden centers, so call ahead to ask whether they sell to the public and whether there is a minimum order. A listing does not show what is in stock. Call before you visit to check plants, sizes and availability.

Our directory has 5 listings in Portage. Compare them on the Portage page.

Growing conditions

USDA hardiness zone: 5a
Avg. minimum winter temp: -20°F
Median frost dates: First ~Oct 10 · Last ~Apr 28

Frost dates: NOAA 1991–2020 Climate Normals, nearest station (PORTAGE WWTP, WI US, 3.5 km away) .

What's plantable right now

Nothing in our crop table has an open planting window for this ZIP right now, check back soon.

Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.

Nearby nurseries

Columbia County Land and Water Conservation Dept Portage, WI
Dixon Shoreline/Landscaping LLC Portage, WI
Edgewater Home & Garden, LLC Portage, WI
Link's Greenhouse, Inc. Portage, WI

Learn to garden in WI →

Frequently asked questions

What type of business is Blackburn's Greenhouse?: Blackburn's Greenhouse is classified as a dealer in Portage, WI.
What USDA growing zone is Blackburn's Greenhouse in?: Blackburn's Greenhouse (ZIP 53901) is in USDA hardiness zone 5a, with an average minimum winter temperature of -20°F.

Source: State registry record. See something wrong? Request a correction or removal →