When to plant in Boswell, PA
Planting dates worked out from Boswell's own frost records, not a generic zone chart.
Safe to plant out
May 23
1 year in 10 has a later frost
Average last frost
May 9
about a 50% chance of a later one
Average first fall frost
Oct 15
1 year in 10 by Oct 3
Frost-free days
159
median, 1991–2020
Station used: Laurel Summit · 9.6 km away · station 832 m, town 566 m. How we match towns to stations
The station sits 266 m higher than the town, so frost dates here may be off by a week or more. Check them against local experience.
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Mar 28 – Apr 11 | May 23 – Jun 6 | Jul 17 |
| Sweet pepper | Mar 14 – Mar 28 | May 23 – Jun 6 | Jul 22 |
| Lettuce (leaf) | Mar 7 – Mar 14 | Apr 11 – Apr 25 | May 21 |
| Peas | — | Apr 9 – May 7 | Jun 3 |
| Bush beans | — | May 16 – Jun 6 | Jul 5 |
| Carrot | — | Apr 18 – May 30 | Jun 17 |
| Beet | — | Apr 18 – May 30 | Jun 7 |
| Potato | — | Apr 18 – May 9 | Jun 27 |
| Kale | Mar 5 – Mar 19 | Apr 16 – Apr 30 | May 29 |
| Broccoli | Feb 28 – Mar 14 | Apr 11 – May 2 | Jun 10 |
| Cucumber | Apr 25 – May 2 | May 23 – Jun 6 | Jul 12 |
| Summer squash and zucchini | Apr 25 – May 2 | May 23 – Jun 6 | Jul 7 |
| Winter squash | Apr 25 – May 2 | May 23 – Jun 6 | Aug 11 |
| Sweet corn | — | May 16 – Jun 6 | Jul 15 |
| Onion (from sets) | — | Apr 11 – May 2 | Jul 10 |
| Garlic | — | Sep 29 – Oct 27 (fall) | following summer |
| Spinach | — | Apr 9 – May 7 | May 17 |
| Basil | Apr 11 – Apr 25 | May 23 – Jun 6 | Jul 19 |
Boswell'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 |
|---|---|
| 2002 | May 22 |
| 2003 | Apr 28 |
| 2005 | May 5 |
| 2006 | May 24 |
| 2007 | Apr 19 |
| 2008 | May 13 |
| 2009 | May 19 |
| 2010 | May 12 |
| 2011 | May 6 |
| 2012 | Apr 29 |
| 2013 | May 26 |
| 2014 | May 6 |
| 2015 | Apr 28 |
| 2016 | May 17 |
| 2017 | May 10 |
| 2018 | May 1 |
| 2019 | Apr 30 |
| 2020 | May 13 |
| 2021 | May 13 |
| 2022 | May 1 |
| 2023 | May 4 |
| 2024 | Apr 23 |
| 2025 | Apr 28 |
| 2026 | May 4 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 2002 | 144 |
| 2003 | 156 |
| 2005 | 172 |
| 2006 | 141 |
| 2007 | 192 |
| 2008 | 142 |
| 2009 | 147 |
| 2010 | 162 |
| 2011 | 148 |
| 2012 | 161 |
| 2013 | 149 |
| 2014 | 165 |
| 2015 | 172 |
| 2016 | 146 |
| 2017 | 159 |
| 2018 | 169 |
| 2020 | 170 |
| 2021 | 172 |
| 2022 | 169 |
| 2023 | 171 |
| 2024 | 175 |
| 2025 | 191 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 2002 | 16.2 °C |
| 2003 | 14.7 °C |
| 2005 | 15.6 °C |
| 2006 | 15.0 °C |
| 2007 | 15.1 °C |
| 2008 | 14.7 °C |
| 2009 | 14.3 °C |
| 2010 | 16.2 °C |
| 2011 | 15.5 °C |
| 2012 | 15.3 °C |
| 2013 | 14.5 °C |
| 2014 | 14.2 °C |
| 2015 | 15.8 °C |
| 2016 | 15.9 °C |
| 2017 | 15.2 °C |
| 2018 | 15.9 °C |
| 2019 | 16.1 °C |
| 2020 | 15.8 °C |
| 2021 | 15.3 °C |
| 2022 | 15.4 °C |
| 2023 | 14.9 °C |
| 2024 | 16.3 °C |
| 2025 | 16.1 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Laurel Summit (NOAA GHCN-Daily). Years with too many missing days are left out.