Port Allegany, PA frost dates
Last spring frostMay 15median date
First fall frostOct 6median date
Growing season144 daysfrost-free
Hardiness zone5bZone 5b
How Port Allegany compares
- In 8 years out of 10, the last spring frost in Port Allegany falls between April 29 and May 29, a 30-day window. The first fall frost falls between September 25 and October 21.
- The median last frost is 18 days later than the Pennsylvania median of Apr 27.
- Its 144-day growing season is longer than 8% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 14 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 165 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 29 |
| 50% (median) | May 15 |
| 10% (safe for tender plants) | May 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 25 |
| 50% (median) | October 6 |
| 90% (late) | October 21 |
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 Port Allegany, PA
Port Allegany, PA frost dates — last frost May 15, first frost Oct 6, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 20 to Mar 6Transplant outside: Apr 17 to May 1
Start indoors: Mar 6 to Mar 20Transplant outside: May 29 to Jun 12
Start indoors: Mar 6 to Mar 20Transplant outside: May 29 to Jun 12
Start indoors: Mar 20 to Apr 3Transplant outside: May 22 to Jun 5
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 24 to May 8Sow outdoors: Apr 17 to May 22Plant for fall: Aug 11 to Sep 8
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 17 to May 1Sow outdoors: Apr 17 to May 1Plant for fall: Jul 28 to Aug 18
Start indoors: Mar 20 to Apr 3Transplant outside: May 1 to May 15Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 24 to May 8Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 20 to Apr 3Transplant outside: May 1 to May 15Plant for fall: Jun 30 to Jul 21
Start indoors: Apr 3 to Apr 17Transplant outside: Jun 5 to Jun 19Sow outdoors: Jun 5 to Jun 19
Start indoors: Apr 3 to Apr 17Transplant outside: May 22 to Jun 5
Sow outdoors: Apr 3 to Apr 24Plant for fall: Jul 14 to Aug 4
Sow outdoors: Apr 3 to Apr 24Plant for fall: Aug 11 to Sep 1
Sow outdoors: Apr 10 to May 22Plant for fall: Aug 25 to Sep 15
Start indoors: Apr 17 to Apr 24Transplant outside: May 29 to Jun 5Sow outdoors: May 22 to Jun 5Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 17 to Apr 24Sow outdoors: May 22 to Jun 5Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 17 to Apr 24Sow outdoors: May 22 to Jun 5
Start indoors: Apr 17 to Apr 24Transplant outside: May 29 to Jun 12
Sow outdoors: Apr 24 to May 22Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 24 to May 22Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 24 to May 15
Sow outdoors: May 1 to May 29Plant for fall: Jul 28 to Aug 11
Sow outdoors: May 1 to May 22Plant for fall: Aug 11 to Sep 1
Sow outdoors: May 22 to Jun 12Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 22 to Jun 5
Transplant outside: May 29 to Jun 19
Plant for fall: Sep 22 to Oct 27
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Port Allegany, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 20 – Mar 6 | Apr 17 – May 1 | — | — |
| Peppers | Mar 6 – Mar 20 | May 29 – Jun 12 | — | — |
| Eggplant | Mar 6 – Mar 20 | May 29 – Jun 12 | — | — |
| Tomatoes | Mar 20 – Apr 3 | May 22 – Jun 5 | — | — |
| Lettuce | Mar 20 – Apr 3 | Apr 24 – May 8 | Apr 17 – May 22 | Aug 11 – Sep 8 |
| Kale | Mar 20 – Apr 3 | Apr 17 – May 1 | Apr 17 – May 1 | Jul 28 – Aug 18 |
| Broccoli | Mar 20 – Apr 3 | May 1 – May 15 | — | Jun 30 – Jul 21 |
| Cabbage | Mar 20 – Apr 3 | Apr 24 – May 8 | — | Jun 30 – Jul 21 |
| Cauliflower | Mar 20 – Apr 3 | May 1 – May 15 | — | Jun 30 – Jul 21 |
| Okra | Apr 3 – Apr 17 | Jun 5 – Jun 19 | Jun 5 – Jun 19 | — |
| Basil | Apr 3 – Apr 17 | May 22 – Jun 5 | — | — |
| Peas | — | — | Apr 3 – Apr 24 | Jul 14 – Aug 4 |
| Spinach | — | — | Apr 3 – Apr 24 | Aug 11 – Sep 1 |
| Radishes | — | — | Apr 10 – May 22 | Aug 25 – Sep 15 |
| Cucumbers | Apr 17 – Apr 24 | May 29 – Jun 5 | May 22 – Jun 5 | Jul 21 – Aug 4 |
| Zucchini & Summer Squash | Apr 17 – Apr 24 | — | May 22 – Jun 5 | Jul 28 – Aug 11 |
| Winter Squash & Pumpkins | Apr 17 – Apr 24 | — | May 22 – Jun 5 | — |
| Melons & Watermelon | Apr 17 – Apr 24 | May 29 – Jun 12 | — | — |
| Carrots | — | — | Apr 24 – May 22 | Jul 14 – Jul 28 |
| Beets | — | — | Apr 24 – May 22 | Jul 28 – Aug 11 |
| Potatoes | — | — | Apr 24 – May 15 | — |
| Swiss Chard | — | — | May 1 – May 29 | Jul 28 – Aug 11 |
| Cilantro | — | — | May 1 – May 22 | Aug 11 – Sep 1 |
| Green Beans | — | — | May 22 – Jun 12 | Jul 21 – Aug 4 |
| Sweet Corn | — | — | May 22 – Jun 5 | — |
| Sweet Potatoes | — | May 29 – Jun 19 | — | — |
| Garlic | — | — | — | Sep 22 – Oct 27 |
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 Port Allegany, PA weather station, about 1 km away (elevation 1,476 ft (450 m)).
Frost dates near Port Allegany
- Turtlepoint May 15 · Oct 6
- Roulette May 22 · Oct 1
- East Smethport May 15 · Oct 6
- Crosby May 15 · Oct 3
- Smethport May 15 · Oct 3
- Eldred May 7 · Oct 11
- Shinglehouse May 20 · Sep 29
- Rixford May 7 · Oct 11
- Duke Center May 7 · Oct 11
- Rew May 18 · Oct 1
Frequently asked questions
When is the last frost in Port Allegany, PA?
The median last spring frost in Port Allegany, PA is May 15. There is still about a 10% chance of frost after May 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Port Allegany, PA?
The median first fall frost is October 6, with about a 10% chance of frost before September 25.
How long is the growing season in Port Allegany, PA?
About 144 days between the median last spring frost and first fall frost.
What planting zone is Port Allegany, PA?
Port Allegany, PA is in USDA hardiness zone 5b.