Ticks are a serious issue here in southern NH. I personally spray my yard/grass at least twice a year now. I tried cedar oil last year because it is supposed to be non toxic to the good insects like bees.
I used to spray permetherin. I still spray that on my boots and my yard work jeans. Sawyer makes a diluted version you can buy at Walmart.
Last year I bought another insecticide that I purchased from an online supply house. There are actually three different insecticides I mix together in my 4 gallon backpack pump sprayer. After spraying this there were no ticks or mosquitos for about a month. I also treat my birdbath and the little pool week keep in the dog yard for the beagles.
We’ve had a real problem here in the Upper Valley as well.
We used insect granules and there is something called an insect growth regulator, which is like a puberty blocker for insects.
The recommendation is to spray a liquid insecticide in a pump sprayer and add this to it. The insecticide takes care of the adults and the IGR takes care of the larva and nymphs.
Control Solutions Inc 13842486 Tekko Pro Insect Growth Regulator 16-Oz
https://www.amazon.com/Control-Solutions-13842486-Insect-Regulator/dp/B07DHFP88Y/ref=asc_df_B07DHFP88Y?hvadid=80608063553907&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584207589880073&psc=1
You can find it other places, but not as cheap.
We’re going to be doing that for the lawn around the house.