When to plant in Susquehanna Trails, PA
Planting dates worked out from Susquehanna Trails's own frost records, not a generic zone chart.
Safe to plant out
Apr 17
1 year in 10 has a later frost
Average last frost
Apr 5
about a 50% chance of a later one
Average first fall frost
Nov 13
1 year in 10 by Oct 31
Frost-free days
221
median, 1991–2020
Station used: Safe Harbor Dam · 18.6 km away · station 59 m, town 141 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 20 – Mar 6 | Apr 17 – May 1 | Jun 11 |
| Sweet pepper | Feb 6 – Feb 20 | Apr 17 – May 1 | Jun 16 |
| Lettuce (leaf) | Feb 13 – Feb 20 | Mar 20 – Apr 3 | Apr 29 |
| Peas | — | Mar 20 – Apr 17 | May 14 |
| Bush beans | — | Apr 12 – May 3 | Jun 1 |
| 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 20 – Mar 27 | Apr 17 – May 1 | Jun 6 |
| Summer squash and zucchini | Mar 20 – Mar 27 | Apr 17 – May 1 | Jun 1 |
| Winter squash | Mar 20 – Mar 27 | Apr 17 – May 1 | Jul 6 |
| Sweet corn | — | Apr 12 – May 3 | Jun 11 |
| Onion (from sets) | — | Mar 20 – Apr 10 | Jun 18 |
| Garlic | — | Oct 21 – Nov 18 (fall) | following summer |
| Spinach | — | Mar 20 – Apr 17 | Apr 27 |
| Basil | Mar 6 – Mar 20 | Apr 17 – May 1 | Jun 13 |
Susquehanna Trails'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 |
|---|---|
| 1995 | Apr 6 |
| 1996 | Apr 18 |
| 2002 | Apr 8 |
| 2003 | Apr 8 |
| 2004 | Apr 7 |
| 2005 | Mar 19 |
| 2006 | Mar 22 |
| 2007 | Apr 12 |
| 2008 | Mar 31 |
| 2009 | Mar 26 |
| 2010 | Mar 28 |
| 2011 | Mar 31 |
| 2012 | Mar 28 |
| 2013 | Apr 6 |
| 2014 | Apr 17 |
| 2015 | Mar 30 |
| 2016 | Apr 10 |
| 2017 | Mar 24 |
| 2018 | Apr 9 |
| 2019 | Apr 2 |
| 2020 | May 9 |
| 2021 | Apr 3 |
| 2022 | May 1 |
| 2023 | Mar 31 |
| 2024 | Mar 26 |
| 2025 | Apr 10 |
| 2026 | Apr 9 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1995 | 212 |
| 2002 | 224 |
| 2003 | 214 |
| 2004 | 216 |
| 2005 | 243 |
| 2006 | 255 |
| 2007 | 200 |
| 2008 | 232 |
| 2009 | 225 |
| 2010 | 245 |
| 2011 | 213 |
| 2012 | 222 |
| 2013 | 211 |
| 2014 | 211 |
| 2015 | 235 |
| 2016 | 226 |
| 2017 | 231 |
| 2018 | 200 |
| 2019 | 220 |
| 2020 | 193 |
| 2021 | 216 |
| 2022 | 197 |
| 2023 | 226 |
| 2024 | 232 |
| 2025 | 224 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1995 | 18.7 °C |
| 1996 | 18.5 °C |
| 2002 | 20.9 °C |
| 2003 | 19.3 °C |
| 2004 | 20.3 °C |
| 2005 | 20.8 °C |
| 2006 | 20.3 °C |
| 2007 | 20.2 °C |
| 2008 | 20.3 °C |
| 2009 | 19.9 °C |
| 2010 | 21.8 °C |
| 2011 | 21.1 °C |
| 2012 | 20.9 °C |
| 2013 | 20.0 °C |
| 2014 | 19.5 °C |
| 2015 | 20.8 °C |
| 2016 | 20.7 °C |
| 2017 | 20.4 °C |
| 2018 | 20.4 °C |
| 2019 | 21.2 °C |
| 2020 | 20.1 °C |
| 2021 | 20.7 °C |
| 2022 | 20.5 °C |
| 2023 | 20.2 °C |
| 2024 | 20.9 °C |
| 2025 | 20.4 °C |
| 2026 | 20.8 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Safe Harbor Dam (NOAA GHCN-Daily). Years with too many missing days are left out.