Bryn Athyn, PA frost dates
Last spring frostApr 4median date
First fall frostNov 7median date
Growing season217 daysfrost-free
Hardiness zone7bZone 7b
How Bryn Athyn compares
- In 8 years out of 10, the last spring frost in Bryn Athyn falls between March 21 and April 17, a 27-day window. The first fall frost falls between October 24 and November 22.
- The median last frost is 23 days earlier than the Pennsylvania median of Apr 27.
- Its 217-day growing season is longer than 96% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is typical for zone 7b, where the median is Apr 5.
- The weather station records an average of 88 nights a year at or below 32°F.
- Compared with Abington, PA, 5 km away, the last frost here is 7 days earlier than there and the growing season is 13 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 21 |
| 50% (median) | April 4 |
| 10% (safe for tender plants) | April 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 24 |
| 50% (median) | November 7 |
| 90% (late) | November 22 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Bryn Athyn, PA
Bryn Athyn, PA frost dates — last frost Apr 4, first frost Nov 7, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 10 to Jan 24Transplant outside: Mar 7 to Mar 21
Start indoors: Jan 24 to Feb 7Transplant outside: Apr 18 to May 2
Start indoors: Jan 24 to Feb 7Transplant outside: Apr 18 to May 2
Start indoors: Feb 7 to Feb 21Transplant outside: Apr 11 to Apr 25
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 14 to Mar 28Sow outdoors: Mar 7 to Apr 11Plant for fall: Sep 12 to Oct 10
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 7 to Mar 21Sow outdoors: Mar 7 to Mar 21Plant for fall: Aug 29 to Sep 19
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 21 to Apr 4Plant for fall: Aug 1 to Aug 22
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 14 to Mar 28Plant for fall: Aug 1 to Aug 22
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 21 to Apr 4Plant for fall: Aug 1 to Aug 22
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 11 to Apr 25
Sow outdoors: Feb 21 to Mar 14Plant for fall: Aug 15 to Sep 5
Sow outdoors: Feb 21 to Mar 14Plant for fall: Sep 12 to Oct 3
Sow outdoors: Feb 28 to Apr 11Plant for fall: Sep 26 to Oct 17
Start indoors: Mar 7 to Mar 14Transplant outside: Apr 18 to Apr 25Sow outdoors: Apr 11 to Apr 25Plant for fall: Aug 22 to Sep 5
Start indoors: Mar 7 to Mar 14Sow outdoors: Apr 11 to Apr 25Plant for fall: Aug 29 to Sep 12
Start indoors: Mar 7 to Mar 14Sow outdoors: Apr 11 to Apr 25
Start indoors: Mar 7 to Mar 14Transplant outside: Apr 18 to May 2
Sow outdoors: Mar 14 to Apr 11Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 14 to Apr 11Plant for fall: Aug 29 to Sep 12
Sow outdoors: Mar 14 to Apr 4
Sow outdoors: Mar 21 to Apr 18Plant for fall: Aug 29 to Sep 12
Sow outdoors: Mar 21 to Apr 11Plant for fall: Sep 12 to Oct 3
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 22 to Sep 5
Sow outdoors: Apr 11 to Apr 25
Transplant outside: Apr 18 to May 9
Plant for fall: Oct 24 to Nov 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bryn Athyn, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 10 – Jan 24 | Mar 7 – Mar 21 | — | — |
| Peppers | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Eggplant | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Tomatoes | Feb 7 – Feb 21 | Apr 11 – Apr 25 | — | — |
| Lettuce | Feb 7 – Feb 21 | Mar 14 – Mar 28 | Mar 7 – Apr 11 | Sep 12 – Oct 10 |
| Kale | Feb 7 – Feb 21 | Mar 7 – Mar 21 | Mar 7 – Mar 21 | Aug 29 – Sep 19 |
| Broccoli | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Aug 1 – Aug 22 |
| Cabbage | Feb 7 – Feb 21 | Mar 14 – Mar 28 | — | Aug 1 – Aug 22 |
| Cauliflower | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Aug 1 – Aug 22 |
| Okra | Feb 21 – Mar 7 | Apr 25 – May 9 | Apr 25 – May 9 | — |
| Basil | Feb 21 – Mar 7 | Apr 11 – Apr 25 | — | — |
| Peas | — | — | Feb 21 – Mar 14 | Aug 15 – Sep 5 |
| Spinach | — | — | Feb 21 – Mar 14 | Sep 12 – Oct 3 |
| Radishes | — | — | Feb 28 – Apr 11 | Sep 26 – Oct 17 |
| Cucumbers | Mar 7 – Mar 14 | Apr 18 – Apr 25 | Apr 11 – Apr 25 | Aug 22 – Sep 5 |
| Zucchini & Summer Squash | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | Aug 29 – Sep 12 |
| Winter Squash & Pumpkins | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | — |
| Melons & Watermelon | Mar 7 – Mar 14 | Apr 18 – May 2 | — | — |
| Carrots | — | — | Mar 14 – Apr 11 | Aug 15 – Aug 29 |
| Beets | — | — | Mar 14 – Apr 11 | Aug 29 – Sep 12 |
| Potatoes | — | — | Mar 14 – Apr 4 | — |
| Swiss Chard | — | — | Mar 21 – Apr 18 | Aug 29 – Sep 12 |
| Cilantro | — | — | Mar 21 – Apr 11 | Sep 12 – Oct 3 |
| Green Beans | — | — | Apr 11 – May 2 | Aug 22 – Sep 5 |
| Sweet Corn | — | — | Apr 11 – Apr 25 | — |
| Sweet Potatoes | — | Apr 18 – May 9 | — | — |
| Garlic | — | — | — | Oct 24 – Nov 28 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Philadelphia Ne Ap, PA weather station, 7 km away (elevation 102 ft (31 m)).
Frost dates near Bryn Athyn
- Huntingdon Valley Apr 4 · Nov 7
- Abington Apr 11 · Nov 1
- Jenkintown Apr 4 · Nov 7
- Willow Grove Apr 11 · Nov 1
- Hatboro Apr 11 · Nov 1
- Feasterville Trevose Apr 21 · Oct 25
- Southampton Apr 21 · Oct 25
- Glenside Apr 11 · Nov 1
- Dresher Apr 11 · Nov 1
- Elkins Park Apr 4 · Nov 7
Frequently asked questions
When is the last frost in Bryn Athyn, PA?
The median last spring frost in Bryn Athyn, PA is April 4. There is still about a 10% chance of frost after April 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bryn Athyn, PA?
The median first fall frost is November 7, with about a 10% chance of frost before October 24.
How long is the growing season in Bryn Athyn, PA?
About 217 days between the median last spring frost and first fall frost.
What planting zone is Bryn Athyn, PA?
Bryn Athyn, PA is in USDA hardiness zone 7b.