Every year, we get a chance to summarize the year that was. There is almost always an undertone of “well, this was unexpected!”, and that would be true for 2025 as well. What’s interesting is the flip from incredibly dry summers to now two straight years of excessive moisture in June and July. It just goes to show that whenever anyone thinks they have things figured out, it will certainly change.
As we officially put 2025 behind us and peek ahead to a new year, this review breaks down the key trends that shaped our turf — what went right, what challenged us, and what we can learn heading into 2026.
A Spring That Started Strong, Then Turned Tricky
Spring arrived early and warm in March, which jump-started turf growth faster than usual. Mixed in with these warmer temperatures were some timely rains that kicked things off in spectacular fashion. Many lawns greened up beautifully through March and into April, and soil temperatures climbed quickly enough that pre-emergent timing mattered more than ever. The first half of April was rather cool before beautiful days returned and persisted through the rest of the month.
But the early warmth came with a catch:
• Soil dried out faster than expected
• Early mowing stress showed up on lawns cut too short
• Spring seeding struggled unless irrigation was consistent
For many homeowners, the season started with optimism — but the weather had a few surprises waiting.
Summer Rains: Bringing the Heat, Humidity and Disease Pressure
June brought the kind of humidity that cool-season grasses hate. That humidity, mixed with very hot stretches and frequent light rains, kicked off a period of intense disease pressure that lasted for months. Dollar spot was rampant, and the conditions favoring it persisted from Memorial Day through Labor Day. Usually, a dry-down in July or August provides some reprieve, but July was littered with light, frequent rains that kept humidity at very uncomfortable levels. It was rare for us to step on a lawn in the summer of 2025 and not find some area affected by dollar spot.
In addition to dollar spot, we continued to see summer patch ravage older, established lawns. This was present in 2024 as well. If you’ve read 2024’s year-in-review blog, you’ll remember that summer patch affecting older lawns is very much an unexpected phenomenon. This soil-borne disease is most frequently seen on sodded lawns less than 10 years old. It speaks to how intense disease pressure was in 2024 and 2025 that we saw so much summer patch. We also saw a few outbreaks of pythium blight, a devastating disease that is typically seen on golf course-grown creeping bentgrass during the hottest stretches of summer.
Disease issues were also pushed along by the fact that grass was growing extremely fast. In the spring and fall, it’s okay for the grass to grow rapidly. But when conditions are ripe for disease, it’s very dangerous for the plant. An abundance of young, green, succulent leaf material is a prime target for fungus.
Weeds…So Many Weeds!
As the title of this piece suggests, the headline-stealer in 2025 was the season-long difficulty with weed control. The early spring forced us to start pre-emergent applications a bit earlier than usual. With the product being applied earlier, that also meant the active ingredient in that treatment lost its effectiveness earlier.
It’s important to note that pre-emergent weed control is geared toward preventing annual grassy weeds like crabgrass and foxtail. Pre-emergent products are applied in the spring with the goal of lasting through the summer but wearing off by fall. That timeline is important since fall is the best time for seeding, and we want the soil to be free of herbicide that could prohibit seeding projects.
Walking that tightrope can be tricky. When we get to “seeding season,” pre-emergent products are predictably tailing off. An additional challenge was thrown our way this season that tested turf managers across the Midwest. The steady light rains and high humidity made soil microbes very active. Microbes are tiny bacteria, fungi, and viruses that work nonstop to decay organic matter, sequester carbon, cycle nutrients, and improve soil structure. Those same microbes are why pesticides in the soil lose effectiveness.
Crabgrass, Foxtail & Broadleaf Took Advantage
With that “shield” coming down faster, it left our lawns susceptible to crabgrass and foxtail. This caused us to examine our application schedule and the products we use, as well as consult with our vendors and partners at Iowa State University. We have 100% confidence that we’re following the best possible schedule to protect lawns from annual grassy weeds, and 2025 was a uniquely challenging year for everyone.
In addition to battling crabgrass and foxtail, our lawns were under constant attack from broadleaf weeds as well. I mentioned grass growing rapidly in summer — the same was certainly true of weeds. Rapidly growing weeds reach maturity and the seed production stage in a shorter amount of time, meaning our soils were consistently being littered with invasive seeds.
We saw a common theme: our regularly scheduled lawn applications were effective on weeds present at the time of application, but a new crop of weeds would arrive before the next application was due. This was a source of frustration, in part due to a common misconception that pre-emergent products work on all weeds. Unfortunately, that is not the case. Most broadleaf weeds are unaffected by pre-emergents, and the best way to prevent them is to maintain a thick, healthy lawn.
Our full-program customers are eligible for free service calls, and we encourage their use. Extra measures were necessary to keep weeds under control.
ANOTHER Dry Fall?! Agh!
2025 saw a continuation of something troublesome that we’ve seen for several years: a dry September.
It cannot be exaggerated how much we need fall rain for our environment — most importantly, to replenish our water supply after summer. In our world, it’s needed to help lawns recover from summer stress and to ensure that fall seeding goes as planned. To put this recent pattern into perspective, from 2018–2020 we received 5.5 inches of rain or more each September (according to data collected at the Eastern Iowa Airport). Since then, September 2021 has been the “wettest” September, with a paltry total of 1.65 inches of rain.
We’re very cautious about using the word “trend,” because weather will always be unpredictable. However, it’s safe to say that we would greatly appreciate a September with ample rainfall. The sooner, the better.
Last Summer Bugged Us!
Earlier, we touched on weather conditions favoring microbial activity and the effect that had on our pre-emergent herbicides. We also saw more white grub activity than normal on treated lawns, and the logical conclusion is that those products had reduced efficacy as well.
Luckily, activity does not necessarily mean damage. Grub control products do not prevent grubs from existing; they make their food source toxic and reduce their populations. Depending on when grub control was applied, certain properties had higher grub populations.
While it was disappointing to see some grub activity on treated lawns, it was encouraging that our lawns were healthy enough to withstand it — and it showed proof that we’re using a good product.
The last few years have seen an increase in summer insect activity, and that carried into 2025 as well. Chinch bugs, billbugs, and sod webworms presented issues once again. However, the rains of June and July kept lawns green and growing, so there was a bit of reprieve. Once we went through periods of dry weather in August and September and lawns were weakened, we saw a sharp increase in insect damage.
Getting Prepared for Spring in 2026
Drought, disease, and insect damage can all occur together if a proper diagnosis isn’t made soon after the plant shows signs of illness. It’s imperative that the professional, experienced staff at ULTRALawn is notified of anything that seems abnormal.
The 2025 growing season was once again dominated by rain patterns. For anyone who wants to keep the grass greener on their side of the fence, proper irrigation and mowing techniques will always be the two most important items a homeowner can tackle to have the biggest impact on lawn health.
For more information on these topics, please visit a few other blogs on our site: “The Power of Mowing Height: Why It Matters” and “I Have My Own Irrigation System — Am I Doing This Right?”
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