When to plant in Somersworth, NH
Planting dates worked out from Somersworth's own frost records, not a generic zone chart.
Safe to plant out
May 13
1 year in 10 has a later frost
Average last frost
May 3
about a 50% chance of a later one
Average first fall frost
Oct 11
1 year in 10 by Sep 29
Frost-free days
162
median, 1991–2020
Station used: Rochester Skyhaven Ap · 5.2 km away · station 100 m, town 71 m. How we match towns to stations
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Mar 18 – Apr 1 | May 13 – May 27 | Jul 7 |
| Sweet pepper | Mar 4 – Mar 18 | May 13 – May 27 | Jul 12 |
| Lettuce (leaf) | Mar 3 – Mar 10 | Apr 7 – Apr 21 | May 17 |
| Peas | — | Apr 7 – May 5 | Jun 1 |
| Bush beans | — | May 6 – May 27 | Jun 25 |
| Carrot | — | Apr 18 – May 30 | Jun 17 |
| Beet | — | Apr 18 – May 30 | Jun 7 |
| Potato | — | Apr 18 – May 9 | Jun 27 |
| Kale | Mar 3 – Mar 17 | Apr 14 – Apr 28 | May 27 |
| Broccoli | Feb 24 – Mar 10 | Apr 7 – Apr 28 | Jun 6 |
| Cucumber | Apr 15 – Apr 22 | May 13 – May 27 | Jul 2 |
| Summer squash and zucchini | Apr 15 – Apr 22 | May 13 – May 27 | Jun 27 |
| Winter squash | Apr 15 – Apr 22 | May 13 – May 27 | Aug 1 |
| Sweet corn | — | May 6 – May 27 | Jul 5 |
| Onion (from sets) | — | Apr 7 – Apr 28 | Jul 6 |
| Garlic | — | Sep 27 – Oct 25 (fall) | following summer |
| Spinach | — | Apr 7 – May 5 | May 15 |
| Basil | Apr 1 – Apr 15 | May 13 – May 27 | Jul 9 |
Somersworth's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's last spring frostLong-term trend
See the data as a table
| Year | Last spring frost |
|---|---|
| 2000 | May 3 |
| 2001 | May 7 |
| 2002 | May 20 |
| 2003 | May 18 |
| 2004 | May 5 |
| 2005 | May 13 |
| 2006 | Apr 30 |
| 2007 | May 7 |
| 2008 | May 2 |
| 2009 | Apr 20 |
| 2010 | May 11 |
| 2011 | Apr 16 |
| 2012 | Apr 30 |
| 2013 | May 6 |
| 2014 | Apr 25 |
| 2015 | May 2 |
| 2016 | Apr 30 |
| 2017 | May 9 |
| 2018 | May 1 |
| 2019 | Apr 18 |
| 2020 | May 9 |
| 2021 | Apr 22 |
| 2022 | May 9 |
| 2023 | May 18 |
| 2024 | Apr 27 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 2000 | 148 |
| 2001 | 154 |
| 2002 | 146 |
| 2003 | 140 |
| 2004 | 152 |
| 2005 | 160 |
| 2006 | 166 |
| 2007 | 162 |
| 2008 | 168 |
| 2009 | 173 |
| 2010 | 159 |
| 2011 | 173 |
| 2012 | 164 |
| 2013 | 171 |
| 2014 | 147 |
| 2015 | 168 |
| 2016 | 163 |
| 2017 | 160 |
| 2018 | 166 |
| 2019 | 169 |
| 2020 | 134 |
| 2021 | 189 |
| 2022 | 164 |
| 2023 | 165 |
| 2024 | 172 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 2000 | 14.9 °C |
| 2001 | 16.2 °C |
| 2002 | 16.5 °C |
| 2003 | 15.8 °C |
| 2004 | 15.8 °C |
| 2005 | 16.6 °C |
| 2006 | 16.9 °C |
| 2007 | 16.1 °C |
| 2008 | 16.2 °C |
| 2009 | 15.8 °C |
| 2010 | 17.9 °C |
| 2011 | 16.9 °C |
| 2012 | 17.0 °C |
| 2013 | 16.6 °C |
| 2014 | 16.2 °C |
| 2015 | 17.3 °C |
| 2016 | 17.0 °C |
| 2017 | 16.8 °C |
| 2018 | 17.1 °C |
| 2019 | 16.5 °C |
| 2020 | 17.0 °C |
| 2021 | 17.4 °C |
| 2022 | 17.9 °C |
| 2023 | 17.8 °C |
| 2024 | 18.8 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Rochester Skyhaven Ap (NOAA GHCN-Daily). Years with too many missing days are left out.