When to plant in Swartzville, PA
Planting dates worked out from Swartzville's own frost records, not a generic zone chart.
Safe to plant out
Apr 22
1 year in 10 has a later frost
Average last frost
Apr 12
about a 50% chance of a later one
Average first fall frost
Oct 28
1 year in 10 by Oct 12
Frost-free days
198
median, 1991–2020
Station used: New Holland 2 Se · 17.6 km away · station 184 m, town 171 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 | Feb 25 – Mar 11 | Apr 22 – May 6 | Jun 16 |
| Sweet pepper | Feb 11 – Feb 25 | Apr 22 – May 6 | Jun 21 |
| Lettuce (leaf) | Feb 13 – Feb 20 | Mar 20 – Apr 3 | Apr 29 |
| Peas | — | Mar 20 – Apr 17 | May 14 |
| Bush beans | — | Apr 15 – May 6 | Jun 4 |
| Carrot | — | Mar 30 – May 11 | May 29 |
| Beet | — | Mar 30 – May 11 | May 19 |
| Potato | — | Mar 30 – Apr 20 | Jun 8 |
| Kale | Feb 13 – Feb 27 | Mar 27 – Apr 10 | May 9 |
| Broccoli | Feb 6 – Feb 20 | Mar 20 – Apr 10 | May 19 |
| Cucumber | Mar 25 – Apr 1 | Apr 22 – May 6 | Jun 11 |
| Summer squash and zucchini | Mar 25 – Apr 1 | Apr 22 – May 6 | Jun 6 |
| Winter squash | Mar 25 – Apr 1 | Apr 22 – May 6 | Jul 11 |
| Sweet corn | — | Apr 15 – May 6 | Jun 14 |
| Onion (from sets) | — | Mar 20 – Apr 10 | Jun 18 |
| Garlic | — | Oct 14 – Nov 11 (fall) | following summer |
| Spinach | — | Mar 20 – Apr 17 | Apr 27 |
| Basil | Mar 11 – Mar 25 | Apr 22 – May 6 | Jun 18 |
Swartzville'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 |
|---|---|
| 1993 | Apr 7 |
| 1994 | Apr 8 |
| 1995 | Apr 6 |
| 1996 | Apr 15 |
| 1997 | Apr 11 |
| 1998 | Apr 11 |
| 1999 | Apr 25 |
| 2000 | Apr 13 |
| 2001 | Apr 19 |
| 2002 | Apr 7 |
| 2003 | Apr 9 |
| 2004 | Apr 6 |
| 2005 | Mar 24 |
| 2006 | Apr 9 |
| 2007 | Apr 14 |
| 2008 | Apr 15 |
| 2009 | Apr 13 |
| 2010 | Apr 14 |
| 2011 | Apr 6 |
| 2012 | Apr 6 |
| 2013 | Apr 21 |
| 2014 | Apr 16 |
| 2015 | Apr 25 |
| 2016 | Apr 13 |
| 2017 | Mar 24 |
| 2018 | Apr 21 |
| 2019 | Apr 3 |
| 2020 | May 10 |
| 2021 | Apr 23 |
| 2022 | Apr 30 |
| 2023 | Apr 25 |
| 2024 | Apr 23 |
| 2025 | Apr 17 |
| 2026 | Apr 21 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1993 | 208 |
| 1994 | 216 |
| 1995 | 211 |
| 1996 | 171 |
| 1997 | 194 |
| 1998 | 205 |
| 1999 | 192 |
| 2000 | 178 |
| 2001 | 171 |
| 2002 | 204 |
| 2003 | 197 |
| 2004 | 216 |
| 2005 | 237 |
| 2006 | 207 |
| 2007 | 197 |
| 2008 | 187 |
| 2009 | 188 |
| 2010 | 200 |
| 2011 | 205 |
| 2012 | 189 |
| 2013 | 195 |
| 2014 | 205 |
| 2015 | 176 |
| 2016 | 195 |
| 2017 | 230 |
| 2018 | 202 |
| 2019 | 198 |
| 2020 | 173 |
| 2021 | 193 |
| 2022 | 161 |
| 2023 | 181 |
| 2024 | 176 |
| 2025 | 182 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1993 | 19.5 °C |
| 1994 | 19.2 °C |
| 1995 | 19.5 °C |
| 1996 | 19.0 °C |
| 1997 | 18.5 °C |
| 1998 | 20.1 °C |
| 1999 | 20.2 °C |
| 2000 | 18.8 °C |
| 2001 | 19.6 °C |
| 2002 | 20.5 °C |
| 2003 | 18.8 °C |
| 2004 | 19.9 °C |
| 2005 | 20.5 °C |
| 2006 | 19.9 °C |
| 2007 | 19.7 °C |
| 2008 | 19.6 °C |
| 2009 | 19.1 °C |
| 2010 | 21.0 °C |
| 2011 | 20.6 °C |
| 2012 | 20.4 °C |
| 2013 | 19.5 °C |
| 2014 | 19.2 °C |
| 2015 | 20.6 °C |
| 2016 | 20.2 °C |
| 2017 | 20.0 °C |
| 2018 | 20.1 °C |
| 2019 | 20.6 °C |
| 2020 | 19.1 °C |
| 2021 | 19.7 °C |
| 2022 | 19.5 °C |
| 2023 | 19.3 °C |
| 2024 | 20.2 °C |
| 2025 | 20.4 °C |
| 2026 | 20.7 °C |
What this means for you: Since 1993, Swartzville's last spring frost has come about 4 days later per decade, on average. The frost-free season has shrunk by about 5 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from New Holland 2 Se (NOAA GHCN-Daily). Years with too many missing days are left out.