Updated September 25, 2025
| Town | Hemlock Woolly Adelgid Year | Elongate Hemlock Scale Year |
| Acworth |
| 2025 |
| Alexandria | 2022 |
|
| Allenstown | 2017 | 2024 |
| Alstead | 2016 |
|
| Alton | 2009 | 2025 |
| Amherst | 2009 | 2009 |
| Andover | 2021 |
|
| Antrim | 2013 | 2023 |
| Atkinson | 2003 | 2017 |
| Auburn | 2008 | 2016 |
| Barnstead | 2021 | 2025 |
| Barrington | 2013 | 2023 |
| Bartlett |
| 2024 |
| Bedford | 2002 | 2017 |
| Belmont | 2022 | 2020 |
| Bennington | 2016 | 2023 |
| Boscawen | 2021 |
|
| Bow | 2015 | 2021 |
| Bradford | 2017 |
|
| Brentwood | 2016 | 2017 |
| Bridgewater | 2022 |
|
| Bristol | 2022 |
|
| Brookfield | 2016 |
|
| Brookline | 2011 | 2016 |
| Candia | 2016 | 2019 |
| Canterbury | 2021 | 2024 |
| Center Harbor | 2021 | 2024 |
| Charlestown | 2014 | 2023 |
| Chester | 2003 | 2016 |
| Chesterfield | 2010 | 2017 |
| Chichester | 2017 | 2022 |
| Concord | 2012 | 2012 |
| Conway | 2021 |
|
| Danville | 2011 | 2016 |
| Deerfield | 2015 | 2019 |
| Deering | 2012 | 2025 |
| Derry | 2011 | 2016 |
| Dover | 2008 | 2024 |
| Dublin | 2011 | 2024 |
| Dunbarton | 2020 | 2020 |
| Durham | 2007 | 2017 |
| East Kingston | 2014 | 2017 |
| Epping | 2014 | 2021 |
| Epsom | 2002 | 2022 |
| Exeter | 2001 | 2011 |
| Farmington | 2009 | 2025 |
| Fitzwilliam | 2013 | 2017 |
| Francestown | 2013 | 2023 |
| Fremont | 2016 | 2016 |
| Gilford | 2015 |
|
| Gilmanton |
| 2025 |
| Gilsum | 2016 | 2024 |
| Goffstown | 2014 | 2016 |
| Greenfield | 2010 | 2017 |
| Greenland | 2011 | 2017 |
| Greenville | 2011 | 2017 |
| Hampstead | 2014 | 2017 |
| Hampton | 2011 | 2013 |
| Hampton Falls | 2007 | 2017 |
| Hancock | 2014 | 2023 |
| Harrisville | 2019 | 2024 |
| Hebron | 2022 |
|
| Henniker | 2012 | 2022 |
| Hillsborough | 2014 | 2021 |
| Hinsdale | 2008 | 2015 |
| Holderness | 2017 |
|
| Hollis | 2004 | 2016 |
| Hooksett | 2020 | 2020 |
| Hopkinton | 2014 | 2014 |
| Hudson | 2007 | 2016 |
| Jackson | 2021 |
|
| Jaffrey | 2003 | 2019 |
| Keene | 2011 | 2010 |
| Kensington | 2004 | 2017 |
| Kingston | 2016 | 2017 |
| Laconia | 2021 | 2024 |
| Langdon | 2016 | 2025 |
| Lee | 2015 | 2024 |
| Lempster | 2021 |
|
| Litchfield | 2016 | 2016 |
| Londonderry | 2013 | 2016 |
| Loudon | 2017 | 2025 |
| Lyndeborough | 2015 | 2017 |
| Madbury | 2008 | 2024 |
| Manchester | 2016 | 2009 |
| Marlborough | 2012 | 2024 |
| Mason | 2010 | 2016 |
| Meredith | 2015 | 2017 |
| Merrimack | 2006 | 2013 |
| Middleton | 2016 |
|
| Milford | 2007 | 2008 |
| Milton | 2021 | 2025 |
| Mont Vernon | 2010 | 2017 |
| Moultonborough | 2013 |
|
| Nashua | 2004 | 2006 |
| Nelson | 2020 | 2023 |
| New Boston | 2013 | 2013 |
| New Castle | 2010 |
|
| New Durham | 2012 | 2025 |
| New Ipswich | 2011 | 2017 |
| Newbury | 2021 |
|
| Newfields | 2014 | 2017 |
| Newington | 2010 | 2021 |
| Newmarket | 2009 | 2017 |
| Newton | 2015 | 2015 |
| North Hampton | 2007 | 2012 |
| Northfield | 2021 |
|
| Northwood | 2015 | 2017 |
| Nottingham | 2009 | 2017 |
| Ossipee | 2021 |
|
| Pelham | 2006 | 2016 |
| Pembroke | 2017 | 2021 |
| Peterborough | 2001 | 2024 |
| Pittsfield | 2020 | 2025 |
| Plaistow | 2016 | 2017 |
| Portsmouth | 2000 | 2012 |
| Raymond | 2014 | 2021 |
| Richmond | 2010 | 2016 |
| Rindge | 2014 | 2016 |
| Rochester | 2014 |
|
| Rollinsford | 2011 |
|
| Roxbury | 2019 | 2023 |
| Rye | 2006 | 2015 |
| Salem | 2006 | 2016 |
| Salisbury | 2017 |
|
| Sanbornton | 2017 |
|
| Sandown | 2011 | 2016 |
| Sandwich | 2022 |
|
| Seabrook | 2006 | 2010 |
| Sharon | 2016 |
|
| Somersworth | 2018 |
|
| South Hampton | 2010 | 2011 |
| Stoddard | 2020 | 2018 |
| Strafford | 2014 | 2012 |
| Stratham | 2007 | 2017 |
| Sullivan | 2019 | 2023 |
| Sunapee | 2021 |
|
| Surry | 2016 | 2024 |
| Sutton | 2020 |
|
| Swanzey | 2011 | 2017 |
| Temple | 2011 | 2016 |
| Troy | 2016 | 2017 |
| Tuftonboro | 2012 | 2013 |
| Wakefield | 2018 | 2025 |
| Walpole | 2013 | 2023 |
| Warner | 2014 | 2024 |
| Washington | 2017 |
|
| Weare | 2013 | 2023 |
| Webster | 2017 |
|
| Westmoreland | 2016 | 2023 |
| Wilton | 2011 | 2016 |
| Winchester | 2010 | 2015 |
| Windham | 2010 | 2016 |
| Windsor | 2016 |
|
| Wolfeboro | 2012 | 2014 |