Frost dates for 16366 — Warren, PA
Last spring frostMay 4median date
First fall frostOct 21median date
Growing season170 daysfrost-free
Hardiness zone6aZone 6a
How Warren compares
- In 8 years out of 10, the last spring frost in Warren falls between April 20 and May 22, a 32-day window. The first fall frost falls between October 6 and November 4.
- The median last frost is 7 days later than the Pennsylvania median of Apr 27.
- Its 170-day growing season is longer than 36% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 5 days later than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 141 nights a year at or below 32°F.
- Compared with Erie, PA, 83 km away, the last frost here is 8 days later than there and the growing season is 22 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 20 |
| 50% (median) | May 4 |
| 10% (safe for tender plants) | May 22 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 6 |
| 50% (median) | October 21 |
| 90% (late) | November 4 |
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 Warren, PA
Frost dates for 16366 — Warren, PA — last frost May 4, first frost Oct 21, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 9 to Feb 23Transplant outside: Apr 6 to Apr 20
Start indoors: Feb 23 to Mar 9Transplant outside: May 18 to Jun 1
Start indoors: Feb 23 to Mar 9Transplant outside: May 18 to Jun 1
Start indoors: Mar 9 to Mar 23Transplant outside: May 11 to May 25
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 13 to Apr 27Sow outdoors: Apr 6 to May 11Plant for fall: Aug 26 to Sep 23
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 6 to Apr 20Sow outdoors: Apr 6 to Apr 20Plant for fall: Aug 12 to Sep 2
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 20 to May 4Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 13 to Apr 27Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 20 to May 4Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 23 to Apr 6Transplant outside: May 25 to Jun 8Sow outdoors: May 25 to Jun 8
Start indoors: Mar 23 to Apr 6Transplant outside: May 11 to May 25
Sow outdoors: Mar 23 to Apr 13Plant for fall: Jul 29 to Aug 19
Sow outdoors: Mar 23 to Apr 13Plant for fall: Aug 26 to Sep 16
Sow outdoors: Mar 30 to May 11Plant for fall: Sep 9 to Sep 30
Start indoors: Apr 6 to Apr 13Transplant outside: May 18 to May 25Sow outdoors: May 11 to May 25Plant for fall: Aug 5 to Aug 19
Start indoors: Apr 6 to Apr 13Sow outdoors: May 11 to May 25Plant for fall: Aug 12 to Aug 26
Start indoors: Apr 6 to Apr 13Sow outdoors: May 11 to May 25
Start indoors: Apr 6 to Apr 13Transplant outside: May 18 to Jun 1
Sow outdoors: Apr 13 to May 11Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 13 to May 11Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 13 to May 4
Sow outdoors: Apr 20 to May 18Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 20 to May 11Plant for fall: Aug 26 to Sep 16
Sow outdoors: May 11 to Jun 1Plant for fall: Aug 5 to Aug 19
Sow outdoors: May 11 to May 25
Transplant outside: May 18 to Jun 8
Plant for fall: Oct 7 to Nov 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Warren, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 9 – Feb 23 | Apr 6 – Apr 20 | — | — |
| Peppers | Feb 23 – Mar 9 | May 18 – Jun 1 | — | — |
| Eggplant | Feb 23 – Mar 9 | May 18 – Jun 1 | — | — |
| Tomatoes | Mar 9 – Mar 23 | May 11 – May 25 | — | — |
| Lettuce | Mar 9 – Mar 23 | Apr 13 – Apr 27 | Apr 6 – May 11 | Aug 26 – Sep 23 |
| Kale | Mar 9 – Mar 23 | Apr 6 – Apr 20 | Apr 6 – Apr 20 | Aug 12 – Sep 2 |
| Broccoli | Mar 9 – Mar 23 | Apr 20 – May 4 | — | Jul 15 – Aug 5 |
| Cabbage | Mar 9 – Mar 23 | Apr 13 – Apr 27 | — | Jul 15 – Aug 5 |
| Cauliflower | Mar 9 – Mar 23 | Apr 20 – May 4 | — | Jul 15 – Aug 5 |
| Okra | Mar 23 – Apr 6 | May 25 – Jun 8 | May 25 – Jun 8 | — |
| Basil | Mar 23 – Apr 6 | May 11 – May 25 | — | — |
| Peas | — | — | Mar 23 – Apr 13 | Jul 29 – Aug 19 |
| Spinach | — | — | Mar 23 – Apr 13 | Aug 26 – Sep 16 |
| Radishes | — | — | Mar 30 – May 11 | Sep 9 – Sep 30 |
| Cucumbers | Apr 6 – Apr 13 | May 18 – May 25 | May 11 – May 25 | Aug 5 – Aug 19 |
| Zucchini & Summer Squash | Apr 6 – Apr 13 | — | May 11 – May 25 | Aug 12 – Aug 26 |
| Winter Squash & Pumpkins | Apr 6 – Apr 13 | — | May 11 – May 25 | — |
| Melons & Watermelon | Apr 6 – Apr 13 | May 18 – Jun 1 | — | — |
| Carrots | — | — | Apr 13 – May 11 | Jul 29 – Aug 12 |
| Beets | — | — | Apr 13 – May 11 | Aug 12 – Aug 26 |
| Potatoes | — | — | Apr 13 – May 4 | — |
| Swiss Chard | — | — | Apr 20 – May 18 | Aug 12 – Aug 26 |
| Cilantro | — | — | Apr 20 – May 11 | Aug 26 – Sep 16 |
| Green Beans | — | — | May 11 – Jun 1 | Aug 5 – Aug 19 |
| Sweet Corn | — | — | May 11 – May 25 | — |
| Sweet Potatoes | — | May 18 – Jun 8 | — | — |
| Garlic | — | — | — | Oct 7 – Nov 11 |
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 Warren, PA weather station, about 1 km away (elevation 1,211 ft (369 m)).
ZIP codes in Warren: 16365 16366 16367
Frost dates near Warren
- Irvine May 4 · Oct 21
- Russell May 4 · Oct 21
- Clarendon May 4 · Oct 21
- Tiona May 4 · Oct 21
- Youngsville May 22 · Sep 30
- Chandlers Valley May 22 · Sep 30
- Sugar Grove May 22 · Sep 30
- Sheffield May 4 · Oct 21
Frequently asked questions
When is the last frost in Warren, PA?
The median last spring frost in Warren, PA is May 4. There is still about a 10% chance of frost after May 22, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Warren, PA?
The median first fall frost is October 21, with about a 10% chance of frost before October 6.
How long is the growing season in Warren, PA?
About 170 days between the median last spring frost and first fall frost.
What planting zone is Warren, PA?
Warren, PA is in USDA hardiness zone 6a.