Walworth County's September Looked Like a Boom. The Rest of 2026 Tells a Quieter Story.

The headline number for the Geneva Lake area this fall is hard to miss. The Wisconsin REALTORS® Association's September 2026 report shows Walworth County with 170 home sales in September 2026. That is up 31.8% from a year earlier. The median price was $419,750, up 15.0%. In the same month, sales across Wisconsin fell 2.4%, and the average 30-year fixed mortgage rate rose to 6.86%, its highest level since January 2025.

The 2026 figures through September show something steadier. Demand in Walworth County is about where it was in 2025. What has changed, month after month, is how little there is to buy. That difference shapes how much room a buyer has to negotiate this winter.

September 2025 Set a Low Bar

A year-over-year change compares this year's month with last year's. When last year's month was weak, the percentage gets big.

September 2025 was a weak month in Walworth County. It had 129 sales and a median of $365,000. For the first nine months of 2025, the county median was $383,000. So September 2026 was measured against a month that ran well below 2025's own average. Here is what WRA reported for each recent month:

Sales swing hard from month to month. July and August were both below 2025, and August was down almost 14%. If you add WRA's monthly counts for July, August and September yourself, the county closed 470 sales in the third quarter of 2026, compared with 457 a year earlier. That is a gain of about 2.8%. That figure is our own sum of the monthly counts, not a quarterly number WRA publishes.

The year-to-date figures tell the same story. Through September 2026, Walworth County recorded 1,176 sales, up 4.5% from the same period of 2025, at a median of $415,950, up 8.6%. That is a healthy year. It is not a rush. And WRA states that its county figures are not seasonally adjusted, so they carry every swing from a busy closing week or a slow one.

The median moves around for a related reason. August's $445,000 came in the month with the fewest sales of the four. A median from about 150 closings shifts with whatever mix of lake homes, in-town homes and condos happened to close that month. It is not a steady reading of what any one house is worth.

The Number That Moved Every Month Was Supply

One column in the table does go the same way every month. Months of inventory measures how long the current listings would last at the current pace of sales. In Walworth County it fell year over year in June, July, August and September 2026. It ended September at 4.6 months, down from 6.0 a year earlier.

Sales were roughly flat, so the inventory measure dropped because fewer homes were for sale. Fewer homes chasing the same number of buyers is what pushes a median up 8.6% in a year when county sales grew 4.5%.

Statewide, the market went the other way. WRA reported that total listings across Wisconsin rose 3.8% between September 2025 and September 2026, and that statewide months of supply improved to 4.4. WRA's chief executive, Tom Larson, explained the general pull on supply in the September release:

"Higher rates also keep potential sellers from listing their homes because they don't want to give up the very favorable rates locked in over the last six years."

WRA offers that as a reason for the statewide numbers. In Walworth County, the same months brought fewer listings relative to sales while closings held roughly level as rates rose.

What 4.6 Months Means at the Negotiating Table

WRA treats six months of supply as a balanced market. Anything below that leans toward sellers. By that measure, Walworth County was a seller's market in September 2026. A year ago it sat right at the balance point.

Next to its neighbors, though, Walworth is still the roomiest market in southeast Wisconsin. In September 2026, months of inventory stood at:

• Walworth: 4.6
• Racine: 3.8
• Kenosha: 3.7
• Milwaukee: 3.7
• Ozaukee: 3.6
• Washington: 3.6
• Waukesha: 3.3
• Southeast region overall: 3.7

Homes in Walworth County also stayed on the market longer than in most of the region. The average was 72 days in September 2026, against 60 for the southeast region. That is faster than the 85 days of September 2025.

Together, these numbers describe a buyer's position this winter. There is less leverage than a year ago, because the cushion of available homes has thinned and the typical listing sells about two weeks faster. There is more leverage than in Waukesha or Ozaukee, where supply is tighter still. A buyer coming from those markets will find a little more room to make conditions and take time here. A buyer who remembers the 2025 market will find less.

The Lake's Top Tier Trades on Its Own Terms

Every figure above comes from one source. WRA says its county numbers are built from MLS data, pulled directly through the Relitix system. A sale that never goes through the MLS may not show up in them. At the top of the Geneva Lake waterfront market, many sales don't go through it.

The clearest example this year is a Folly Lane estate. The Real Deal reported that it sold for $20 million, with terms agreed in March and the sale closed on Oct. 7. The property covers 10 acres with 222 feet of lake frontage. The same report said only three Lake Geneva area properties had sold for more than $20 million in the previous five years. The one before Folly Lane was a sale near Lackey Lane in June 2025. It also said waterfront deals there usually happen off the market.

Supply at that level is thinner than anything in the county tables. The Real Deal counted fewer than 10 publicly marketed luxury waterfront listings on Geneva Lake at most times. As of mid-October 2026 it found six active listings, and two of those were reportedly under contract. In that story, Bob Webster said a waterfront listing in October or November now has as good a chance as one launched in July or August, because there is so little inventory.

The thinning supply in the county numbers is a mild version of what has been happening on the lakeshore for some time. A county moving from 6.0 months of inventory to 4.6 still offers choices. A shoreline with six public luxury listings, two of them already spoken for, offers a buyer very few. A county median of $419,750 measures something real, but it says very little about the price of lake frontage.

Questions Buyers Raise

Does September's 31.8% jump mean Walworth County is heating up fast?

The broader 2026 data does not support that. Sales fell year over year in July and August 2026. Third-quarter closings ran about 2.8% ahead of 2025, and year-to-date sales through September were up 4.5%. September's jump is measured against an unusually slow September 2025.

Is the county median a fair guide to lakefront prices?

It describes the county's mix of homes, and that mix changes from month to month. Waterfront estates sell at a different scale, and a sale that closes privately may not appear in the MLS data WRA uses. Lakefront value comes from comparing individual waterfront sales, not from a county median.

Which number signals a change in bargaining power?

Months of inventory. In 2026 it has moved more steadily than price or sales count. Walworth County's reading fell year over year in each month from June through September 2026. A reversal in that column would be the first sign that buyers are gaining room again.

A county median can't price a stretch of Geneva Lake shoreline. That takes a careful comparison of individual waterfront sales. Bob Webster has spent more than 40 years watching the lake's waterfront market and can put your property in that context, discreetly and on your timeline. Request a confidential market valuation.