Why Ignoring Seasonality Ruins RV Park Pro Formas

Ignoring seasonality means you build a pro forma on an average occupancy number that never actually happens in any single month, and that gap is where deals fall apart. A park that averages 65% occupancy for the year might run 98% in July and 20% in February. If you underwrite to the average, your debt service coverage looks fine on paper and falls apart in Q1.

This is not a small rounding error. It is the difference between a deal that cash flows through winter and one that requires a capital call to cover the mortgage.

The Math Behind the Mistake

Say a 100-site park generates $1.2 million in annual revenue at a blended 65% occupancy. A sloppy pro forma divides that by 12 and assumes $100,000 a month, every month. Reality looks more like this:

• June through August: near 100% occupancy, site rentals plus amenity fees pushing $160,000 to $180,000 a month

• Shoulder months (April, May, September, October): 50% to 70% occupancy, revenue in the $80,000 to $100,000 range

• December through February: 15% to 30% occupancy depending on climate and market, revenue as low as $25,000 to $40,000 a month

Add those up and you can still land near $1.2 million for the year. But the monthly cash flow curve is nothing like a flat line, and your debt service, payroll, and utility costs do not flex down the way revenue does. We break down exactly why this curve looks the way it does in our post on why RV park occupancy hits 100% in summer but sits empty in winter.

Why Cap Rates Already Price In This Risk

RV parks commonly trade at cap rates between 7% and 12%, noticeably higher than multifamily or industrial. That spread is not random. It reflects operational intensity and the lumpy, seasonal nature of cash flow. A buyer underwriting a park at a 7% cap needs to be honest that the 7% is an average return smoothing over months where the property loses money and months where it prints cash. If your pro forma does not model that swing explicitly, you have not actually underwritten the deal. You have underwritten a fantasy version of it.

The Flat Growth Trap

The post-pandemic surge in RV travel and park occupancy was real, but it was an anomaly, not a trend line. Forecast growth for the RV park sector is flat, in the 0% to 1% range annually through the rest of the decade. Plenty of pro formas still get built with 3% to 5% annual revenue growth baked in, copied over from multifamily templates or hotel comps. That assumption alone can overstate five-year NOI by 15% to 25%.

If growth is flat, your NOI gains have to come from somewhere else. That means:

• Margin improvement through better expense control, energy efficiency, and staffing efficiency during shoulder and off-season months

• Value-add work like adding full hookup sites, upgrading to 50-amp service, or converting overflow grass sites into permanent pads

• Diversifying revenue beyond nightly site rentals into private lot leases, storage, propane sales, and amenity fees like laundry, showers, and firewood

A park that leans only on rate increases during peak months to drive returns is fighting a market that is not growing. A park that improves margin and adds revenue streams has a real path to increasing NOI even in a flat-growth environment.

What an Honest Pro Forma Looks Like

A defensible underwriting model for an RV park should include:

• Month-by-month occupancy assumptions built from the property's actual trailing 24 to 36 months of data, not a blended annual average

• Separate line items for peak season revenue (sites, amenities, overflow) versus off-season revenue (long-term stays, storage, private lot leases)

• Debt service stress-tested against the worst three consecutive months, not the annual average

• A cash reserve sized to cover the winter shortfall, typically three to six months of fixed costs depending on climate

• Flat or near-flat revenue growth assumptions, with NOI growth modeled from margin and value-add work instead

Operators who have already lived through a winter season know how to build this reserve and staff around it. For the specific tactics that keep a park solvent from November through March, our post on winter occupancy strategies for RV parks covers what actually works, from long-term stay discounts to storage conversions.

The Tradeoff Investors Need to Accept

Seasonality is not a flaw to underwrite around, it is a permanent feature of this asset class. Investors who want smooth, predictable monthly distributions are better suited to other real estate types. Investors who understand the seasonal curve, size their reserves correctly, and value operators who diversify revenue streams can still hit that 7% to 12% cap rate return, but only if the pro forma reflects reality instead of a flattened average.

If you are evaluating an RV park deal and want a second set of eyes on the seasonality assumptions in the pro forma, reach out to the Invest With Zac team for a direct conversation. Getting this one variable right or wrong determines whether the deal survives its first winter.