Farming Land in Grundy County, Iowa

A quantifiable distinction: Iowa's 2nd-highest CSR2 average

Iowa's Corn Suitability Rating 2 (CSR2) system scores cropland on its inherent productivity, and Grundy County's average CSR2 of 86.9 ranks second among all 99 Iowa counties, trailing only O'Brien County in northwest Iowa. That's not a marketing claim -- CSR2 is a standardized, soil-survey-based metric used throughout the state for everything from land valuation to property tax assessment, and Grundy's ranking reflects the deep, well-drained loess and glacial till soils that make much of the county exceptionally productive for corn and soybeans.

That said, a county average is exactly that -- an average. Individual fields within Grundy County vary, with some tracts carrying CSR2 scores well above 90 and others considerably lower depending on drainage, slope, and soil series. Before valuing or offering on a specific parcel, pull its actual CSR2 rating (available through the County Assessor's office or Iowa State University's Soil Survey data) rather than assuming the county average applies to any given field.

What that soil quality costs: farmland values and cash rents

Grundy County's soil quality shows up directly in price. Recent farmland-value estimates for the county have run roughly $13,600 to $15,300 per acre on average depending on the data source and quality tier (with high-quality ground averaging meaningfully more than that), and individual 2025 auction sales have averaged upward of $16,000 per acre in some reporting. Cash rental rates have followed the same pattern: Grundy County has ranked among the five highest-cash-rent counties in Iowa in recent Iowa State University Extension Ag Decision Maker surveys, at roughly $311 per acre in 2025, and the county has historically posted some of the state's highest non-irrigated cropland rents.

For a buyer, the practical takeaway is that Grundy County farmland trades at a real premium to the Iowa average, and that premium is broadly justified by soil productivity rather than speculation -- but it also means a buyer working from a statewide average price expectation will likely be under-budgeted here. Use per-CSR2-point pricing (dividing a comparable sale's price by its CSR2 average) rather than a flat per-acre figure when comparing a specific Grundy County tract to sales elsewhere in the state.

Drainage, tiling, and lease terms still matter on top-tier ground

Even on high-CSR2 ground, drainage remains a real value driver: well-tiled fields allow earlier planting and reduce yield losses in wet years, and Iowa-wide data shows tiled ground commanding a meaningful premium (commonly cited in the $15-$30/acre range for cash rent) over comparable untiled fields. If you're evaluating an existing Grundy County farm, ask directly about tile age, coverage, and any known drainage-district obligations tied to the parcel -- these details affect both productivity and the ongoing cost of ownership, and they're not always obvious from a plat map or aerial photo alone.

If the land comes with an existing cash-rent tenant, confirm the current lease's rate, term, and renewal timing against ISU Extension's most recent county-level cash rent survey -- Grundy's rents have tracked near the top of the state, so an outdated or below-market lease inherited from a prior owner may be worth renegotiating at the next opportunity rather than assumed to reflect current market value.

What to verify before buying farmland in Grundy County

• The specific parcel's CSR2 rating from the County Assessor's office or Iowa State University soil survey data -- not the county average.
• Recent comparable sales priced on a per-CSR2-point basis, not just a flat per-acre figure, given how much productivity varies within the county.
• Tile drainage age, coverage, and any drainage-district assessments or obligations attached to the parcel.
• If the land is leased, the current cash rent rate and term against ISU Extension's most recent Cash Rental Rates for Iowa survey for Grundy County.
• Any zoning or Development Ordinance restrictions on non-farm structures or uses if you plan anything beyond row-crop production -- confirm directly with Grundy County Zoning.