Spring Mills, PA frost dates
Last spring frostMay 5median date
First fall frostOct 6median date
Growing season154 daysfrost-free
Hardiness zone6bZone 6b
How Spring Mills compares
- In 8 years out of 10, the last spring frost in Spring Mills falls between April 22 and May 24, a 32-day window. The first fall frost falls between September 25 and October 21.
- The median last frost is 8 days later than the Pennsylvania median of Apr 27.
- Its 154-day growing season is longer than 14% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 13 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 152 nights a year at or below 32°F.
- Compared with Harrisburg, PA, 88 km away, the last frost here is 20 days later than there and the growing season is 37 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 22 |
| 50% (median) | May 5 |
| 10% (safe for tender plants) | May 24 |
| 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 Spring Mills, PA
Spring Mills, PA frost dates — last frost May 5, first frost Oct 6, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 10 to Feb 24Transplant outside: Apr 7 to Apr 21
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Mar 10 to Mar 24Transplant outside: May 12 to May 26
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 7 to May 12Plant for fall: Aug 11 to Sep 8
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 7 to Apr 21Sow outdoors: Apr 7 to Apr 21Plant for fall: Jul 28 to Aug 18
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 24 to Apr 7Transplant outside: May 26 to Jun 9Sow outdoors: May 26 to Jun 9
Start indoors: Mar 24 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Mar 24 to Apr 14Plant for fall: Jul 14 to Aug 4
Sow outdoors: Mar 24 to Apr 14Plant for fall: Aug 11 to Sep 1
Sow outdoors: Mar 31 to May 12Plant for fall: Aug 25 to Sep 15
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to May 26Sow outdoors: May 12 to May 26Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to Jun 2
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 14 to May 5
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 21 to May 12Plant for fall: Aug 11 to Sep 1
Sow outdoors: May 12 to Jun 2Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 12 to May 26
Transplant outside: May 19 to Jun 9
Plant for fall: Sep 22 to Oct 27
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Spring Mills, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 10 – Feb 24 | Apr 7 – Apr 21 | — | — |
| Peppers | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Eggplant | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Tomatoes | Mar 10 – Mar 24 | May 12 – May 26 | — | — |
| Lettuce | Mar 10 – Mar 24 | Apr 14 – Apr 28 | Apr 7 – May 12 | Aug 11 – Sep 8 |
| Kale | Mar 10 – Mar 24 | Apr 7 – Apr 21 | Apr 7 – Apr 21 | Jul 28 – Aug 18 |
| Broccoli | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 30 – Jul 21 |
| Cabbage | Mar 10 – Mar 24 | Apr 14 – Apr 28 | — | Jun 30 – Jul 21 |
| Cauliflower | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 30 – Jul 21 |
| Okra | Mar 24 – Apr 7 | May 26 – Jun 9 | May 26 – Jun 9 | — |
| Basil | Mar 24 – Apr 7 | May 12 – May 26 | — | — |
| Peas | — | — | Mar 24 – Apr 14 | Jul 14 – Aug 4 |
| Spinach | — | — | Mar 24 – Apr 14 | Aug 11 – Sep 1 |
| Radishes | — | — | Mar 31 – May 12 | Aug 25 – Sep 15 |
| Cucumbers | Apr 7 – Apr 14 | May 19 – May 26 | May 12 – May 26 | Jul 21 – Aug 4 |
| Zucchini & Summer Squash | Apr 7 – Apr 14 | — | May 12 – May 26 | Jul 28 – Aug 11 |
| Winter Squash & Pumpkins | Apr 7 – Apr 14 | — | May 12 – May 26 | — |
| Melons & Watermelon | Apr 7 – Apr 14 | May 19 – Jun 2 | — | — |
| Carrots | — | — | Apr 14 – May 12 | Jul 14 – Jul 28 |
| Beets | — | — | Apr 14 – May 12 | Jul 28 – Aug 11 |
| Potatoes | — | — | Apr 14 – May 5 | — |
| Swiss Chard | — | — | Apr 21 – May 19 | Jul 28 – Aug 11 |
| Cilantro | — | — | Apr 21 – May 12 | Aug 11 – Sep 1 |
| Green Beans | — | — | May 12 – Jun 2 | Jul 21 – Aug 4 |
| Sweet Corn | — | — | May 12 – May 26 | — |
| Sweet Potatoes | — | May 19 – Jun 9 | — | — |
| 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 Millheim, PA weather station, 9 km away (elevation 1,119 ft (341 m)).
Frost dates near Spring Mills
- Centre Hall Apr 20 · Oct 26
- Millheim May 5 · Oct 6
- Mingoville May 5 · Oct 6
- Coburn May 5 · Oct 6
- Madisonburg May 5 · Oct 6
- Aaronsburg May 5 · Oct 6
- Milroy Apr 21 · Oct 24
- Bellefonte Apr 20 · Oct 26
- Rebersburg May 5 · Oct 6
- Lamar Apr 30 · Oct 20
Frequently asked questions
When is the last frost in Spring Mills, PA?
The median last spring frost in Spring Mills, PA is May 5. There is still about a 10% chance of frost after May 24, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Spring Mills, 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 Spring Mills, PA?
About 154 days between the median last spring frost and first fall frost.
What planting zone is Spring Mills, PA?
Spring Mills, PA is in USDA hardiness zone 6b.