Frost dates for 15902 — Johnstown, PA
Last spring frostApr 29median date
First fall frostOct 21median date
Growing season175 daysfrost-free
Hardiness zone6bZone 6b
How Johnstown compares
- In 8 years out of 10, the last spring frost in Johnstown falls between April 14 and May 17, a 33-day window. The first fall frost falls between October 5 and November 5.
- The median last frost is 2 days later than the Pennsylvania median of Apr 27.
- Its 175-day growing season is longer than 47% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 7 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 127 nights a year at or below 32°F.
- Compared with Pittsburgh, PA, 95 km away, the last frost here is 5 days later than there and the growing season is 11 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 14 |
| 50% (median) | April 29 |
| 10% (safe for tender plants) | May 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 21 |
| 90% (late) | November 5 |
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 Johnstown, PA
Frost dates for 15902 — Johnstown, PA — last frost Apr 29, first frost Oct 21, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 4 to Feb 18Transplant outside: Apr 1 to Apr 15
Start indoors: Feb 18 to Mar 4Transplant outside: May 13 to May 27
Start indoors: Feb 18 to Mar 4Transplant outside: May 13 to May 27
Start indoors: Mar 4 to Mar 18Transplant outside: May 6 to May 20
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 8 to Apr 22Sow outdoors: Apr 1 to May 6Plant for fall: Aug 26 to Sep 23
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 1 to Apr 15Sow outdoors: Apr 1 to Apr 15Plant for fall: Aug 12 to Sep 2
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 15 to Apr 29Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 8 to Apr 22Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 15 to Apr 29Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 18 to Apr 1Transplant outside: May 20 to Jun 3Sow outdoors: May 20 to Jun 3
Start indoors: Mar 18 to Apr 1Transplant outside: May 6 to May 20
Sow outdoors: Mar 18 to Apr 8Plant for fall: Jul 29 to Aug 19
Sow outdoors: Mar 18 to Apr 8Plant for fall: Aug 26 to Sep 16
Sow outdoors: Mar 25 to May 6Plant for fall: Sep 9 to Sep 30
Start indoors: Apr 1 to Apr 8Transplant outside: May 13 to May 20Sow outdoors: May 6 to May 20Plant for fall: Aug 5 to Aug 19
Start indoors: Apr 1 to Apr 8Sow outdoors: May 6 to May 20Plant for fall: Aug 12 to Aug 26
Start indoors: Apr 1 to Apr 8Sow outdoors: May 6 to May 20
Start indoors: Apr 1 to Apr 8Transplant outside: May 13 to May 27
Sow outdoors: Apr 8 to May 6Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 8 to May 6Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 8 to Apr 29
Sow outdoors: Apr 15 to May 13Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 15 to May 6Plant for fall: Aug 26 to Sep 16
Sow outdoors: May 6 to May 27Plant for fall: Aug 5 to Aug 19
Sow outdoors: May 6 to May 20
Transplant outside: May 13 to Jun 3
Plant for fall: Oct 7 to Nov 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Johnstown, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 4 – Feb 18 | Apr 1 – Apr 15 | — | — |
| Peppers | Feb 18 – Mar 4 | May 13 – May 27 | — | — |
| Eggplant | Feb 18 – Mar 4 | May 13 – May 27 | — | — |
| Tomatoes | Mar 4 – Mar 18 | May 6 – May 20 | — | — |
| Lettuce | Mar 4 – Mar 18 | Apr 8 – Apr 22 | Apr 1 – May 6 | Aug 26 – Sep 23 |
| Kale | Mar 4 – Mar 18 | Apr 1 – Apr 15 | Apr 1 – Apr 15 | Aug 12 – Sep 2 |
| Broccoli | Mar 4 – Mar 18 | Apr 15 – Apr 29 | — | Jul 15 – Aug 5 |
| Cabbage | Mar 4 – Mar 18 | Apr 8 – Apr 22 | — | Jul 15 – Aug 5 |
| Cauliflower | Mar 4 – Mar 18 | Apr 15 – Apr 29 | — | Jul 15 – Aug 5 |
| Okra | Mar 18 – Apr 1 | May 20 – Jun 3 | May 20 – Jun 3 | — |
| Basil | Mar 18 – Apr 1 | May 6 – May 20 | — | — |
| Peas | — | — | Mar 18 – Apr 8 | Jul 29 – Aug 19 |
| Spinach | — | — | Mar 18 – Apr 8 | Aug 26 – Sep 16 |
| Radishes | — | — | Mar 25 – May 6 | Sep 9 – Sep 30 |
| Cucumbers | Apr 1 – Apr 8 | May 13 – May 20 | May 6 – May 20 | Aug 5 – Aug 19 |
| Zucchini & Summer Squash | Apr 1 – Apr 8 | — | May 6 – May 20 | Aug 12 – Aug 26 |
| Winter Squash & Pumpkins | Apr 1 – Apr 8 | — | May 6 – May 20 | — |
| Melons & Watermelon | Apr 1 – Apr 8 | May 13 – May 27 | — | — |
| Carrots | — | — | Apr 8 – May 6 | Jul 29 – Aug 12 |
| Beets | — | — | Apr 8 – May 6 | Aug 12 – Aug 26 |
| Potatoes | — | — | Apr 8 – Apr 29 | — |
| Swiss Chard | — | — | Apr 15 – May 13 | Aug 12 – Aug 26 |
| Cilantro | — | — | Apr 15 – May 6 | Aug 26 – Sep 16 |
| Green Beans | — | — | May 6 – May 27 | Aug 5 – Aug 19 |
| Sweet Corn | — | — | May 6 – May 20 | — |
| Sweet Potatoes | — | May 13 – Jun 3 | — | — |
| 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 Johnstown Cambria Co Ap, PA weather station, 5 km away (elevation 2,283 ft (696 m)).
ZIP codes in Johnstown: 15901 15902 15904 15905 15906 15907 15909 15915
Frost dates near Johnstown
- Tire Hill Apr 29 · Oct 21
- Parkhill Apr 29 · Oct 21
- Elton Apr 29 · Oct 21
- Hollsopple Apr 29 · Oct 21
- Mineral Point Apr 29 · Oct 21
- Salix Apr 29 · Oct 21
- Davidsville Apr 29 · Oct 21
- Windber Apr 29 · Oct 21
Frequently asked questions
When is the last frost in Johnstown, PA?
The median last spring frost in Johnstown, PA is April 29. There is still about a 10% chance of frost after May 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Johnstown, PA?
The median first fall frost is October 21, with about a 10% chance of frost before October 5.
How long is the growing season in Johnstown, PA?
About 175 days between the median last spring frost and first fall frost.
What planting zone is Johnstown, PA?
Johnstown, PA is in USDA hardiness zone 6b.