What the moratorium does

Dane County says the resolution prevents the county from receiving applications for, and granting zoning permits related to the placement or construction of hyperscale data centers for the next 18 months.

The county narrows the definition to facilities that use at least 5,000 servers and occupy at least 10,000 square feet of floor space—so smaller data center infrastructure is not covered.

Where it applies (and where it doesn’t)

This is a county-zoning action, not a city-of-Madison zoning decision. The moratorium applies to towns subject to county zoning, and it does not apply to cities, villages, or towns that have adopted their own zoning codes.

For residents and businesses in the Madison metro, that jurisdiction detail matters: permitting timelines can vary depending on whether a potential site is inside a self-zoned municipality versus an unincorporated town governed by Dane County.

Why the county is pausing

The county says it’s using the moratorium to study how a rapidly expanding category of development fits within Dane County’s land-use framework. The resolution directs that staff examine environmental, economic, health, and safety implications and develop zoning regulations aligned with the Dane County Comprehensive Plan.

Dane County also points to its Advisory Committee on Data Centers, which is conducting that work during the moratorium window.

Timeline: what Madison-area readers should watch next

While the resolution is for 18 months, local coverage describes the practical pause window as running through December 2027. That means applicants considering hyperscale sites in Dane County’s unincorporated, county-zoned areas should expect additional uncertainty while the county updates its next-step zoning approach.

The move lands in the middle of a broader Wisconsin pattern: other communities—including Madison—have passed their own data center moratoriums or permit restrictions as they weigh resource and infrastructure concerns. Dane County’s action is distinct, though, because it targets the county zoning process for unincorporated areas.

Sources

• Dane County press release: Board approves 18-month pause on hyperscale data center development
• Dane County Legistar: RES-039 (2026) final action / County Executive signature
• Isthmus: Reader-facing timeline and Madison-area context for Dane County’s moratorium
• Wisconsin Public Radio: Statewide context and links to Madison’s earlier moratorium

What Dane County adopted (and when)

Dane County Resolution 2026 RES-039 was adopted by the County Board on June 4, 2026 and signed by the County Executive on June 8, 2026. The county said the moratorium is meant to give its Advisory Committee on Data Centers time to finish research and help inform possible policy changes.

What the moratorium actually does

In plain terms, the county action creates a moratorium on the receipt of applications for—and the granting of zoning-related permits—for the placement or construction of hyperscale data centers in Dane County.

That’s narrower than a broad “development moratorium.” The resolution text says it is not intended to be, and does not constitute, a Wisconsin “development moratorium.” It’s focused on zoning-permit issuance tied to this specific type of data center.

The definition Mount Horeb residents should use: “hyperscale”

The resolution defines a hyperscale data center as a data center that uses at least 5,000 servers and includes at least 10,000 square feet of floor space.

So, if you hear “a data center” discussed locally, residents and businesses should get specific about whether the project meets those thresholds.

Who is covered—and who is not

Dane County’s own materials say the moratorium is designed to apply to towns subject to county zoning. It does not apply to cities, villages, or towns that have adopted their own zoning codes.

That matters in Mount Horeb because Mount Horeb has its own adopted zoning ordinance.

So does it affect Mount Horeb? Location determines the zoning authority

Mount Horeb’s zoning code (Chapter 17) states that the chapter is applicable to territory within the corporate limits of the Village of Mount Horeb. It also defines “extraterritorial zoning” as the area outside village limits where the village has exercised extraterritorial zoning powers.

Putting those two pieces together:

• If a hyperscale data center proposal is inside Mount Horeb village limits, the village’s zoning authority is the governing framework for local zoning review.
• If a hyperscale proposal is outside village limits, the next question becomes whether the site is in a Dane County town under county zoning (a situation where the county moratorium may limit zoning-permit issuance) versus in an area where Mount Horeb’s zoning authority applies.

What to watch next: the “18-month clock” may not start on June 8

The resolution text says the moratorium is in effect for 18 months from the ordinance’s effective date (with the county clerk to insert that effective date) or until it is rescinded, whichever comes earlier. That means residents should not assume June 8, 2026 is automatically the start of the 18-month period.

If more hyperscale data-center proposals are discussed around Mount Horeb, the practical checklist is straightforward: Does it meet the 5,000-server / 10,000-square-foot hyperscale definition? And is the site within Mount Horeb’s village zoning jurisdiction or in a Dane County town under county zoning?

Sources

• Dane County press release: “Dane County Board Introduces Moratorium on Data Center Development” (includes applicability language)
• Dane County Legistar page: 2026 RES-039 (resolution status + final action/signing dates)
• Village of Mount Horeb zoning code, Chapter 17 (adopted; applicability inside village limits)
• League of Wisconsin Municipalities: Mount Horeb Village Administrator position profile (place context)