Iowa's Deer Harvest Is Two Series, and the 2005 Peak Can't Be Compared

How far has Iowa's deer harvest fallen from its 2005 peak? The state's own table cannot say, because the Iowa DNR marks harvest estimates from 2005 and prior as not comparable to later years. The fall you can measure sits inside the reported series that begins in 2006: 32.3%, from 150,552 deer to 101,919 in 2025, with every season since 2013 between 99,414 and 109,600. We show the two series apart and leave the join out.

The natural answer to how far Iowa's harvest has dropped since 2005 is a percentage. The Iowa DNR's 2025-2026 white-tailed deer program report is the source of the long series, and its historical table, Table 1.3, carries a footnote on the grand total: "Harvest estimates from 2005 and prior are not comparable to subsequent years." A caption on another chart in the same report names the difference. It says that since 2006 harvest has been reported, and that this is not directly comparable to the earlier estimates, which came from mail card surveys.

So the table holds two rulers. Each covers its own years, and neither can be laid against the other. Any percent that starts at 2005 and ends at a later season joins them, and we print neither a percent nor a difference in deer across that line. The 2005 and 2006 rows sit next to each other in the table, and the eye wants to subtract them. The footnote says to leave them alone.

Within its own years the older series climbs across five decades. The estimate was 4,008 deer in 1953, 13,780 in 1970 and 22,660 in 1980. It stood at 99,712 in 1989, slid to 76,430 by 1993, then climbed again and first passed 100,000 in 1996 with 107,632. By 2000 it was 126,535. The biggest single-year climb on the chart comes late, from 140,490 in 2002 to 182,856 in 2003, and the series ends at its peak, 211,451 in 2005.

The second series starts at 150,552 in 2006 and falls in every season for seven straight years, passing 127,094 in 2010 and reaching 99,414 in 2013. That is the low point of the reported series, and it is 51,138 below where the series began. After 2013 the line wobbles inside a narrow band and no longer slides. The 13 seasons from 2013 through 2025 range from that 99,414 up to 109,600 in 2022, with 2019 coming in at 99,999, one deer short of 100,000. The 2025 season closed at 101,919, which is 2,505 above the 2013 low.

The 32.3% drop from 2006 to 2025 had happened by 2013, and since then the line has moved sideways inside its band. The DNR says its population model aligns well with the harvest and bowhunter observation data. The report says the model was informed by the estimated harvest from 2006 to 2025 and indicates that the statewide herd declined from 2006 to 2013, stabilized from 2013 to 2017, increased slightly until 2023, then stabilized or decreased over the last couple of years. Because harvest went into that model, its agreement with the harvest line is no independent check on either, and the reading of the herd belongs to the DNR.

The table below puts selected years from both series in one place, with the DNR's break marked in the last column. Our year-by-year figures match the grand total column of Table 1.3 in 73 of 73 years, 1953 through 2025, which checks our copying and says nothing about how either series was built.

Read it as two blocks. The eight rows through 2005 answer the question "how many deer did the DNR estimate that year," and the seven rows from 2006 answer "how many did hunters report." A move from 2006 to 2010 stays inside the reported block and can be read as a change in reported harvest. A move from 2005 to any later row cannot.

Everything here is the DNR's statewide grand total, with no adjustment from us. We built no bridge between the series, and the DNR's footnote gives us no basis for one. Harvest reflects license numbers, antlerless quotas and hunter effort as well as deer, so neither series is a herd count.

Deer numbers for the same season are easy to mix up. The 101,919 for 2025 is the count hunters reported. The DNR separately estimates total hunting mortality for that season at 153,239, which adds allowances for reporting noncompliance and wounding loss. Its population model is a third kind of number altogether. When someone quotes an Iowa deer number, ask which of these it is.

We believe Iowa's harvest history should be read in two pieces, so hunters should refuse any claim that spans 2005 and 2006 without asking where each end came from. For trend talk, use 2006 onward. For a sense of an ordinary recent season, use the band that has held since 2013: 99,414 to 109,600 reported deer. A season inside that band matches the last 13 years, and a season outside it would be worth checking against the DNR's report.

The statewide number is a poor guide to where you should hunt. For that, county rates are more useful, and our county ranking for Iowa averages 2020 to 2024, which puts every season it uses inside the reported series. Our field guide to reading government deer numbers covers other ways a table can mislead.