Frost dates for 16640Flinton, PA
The average last spring frost in Flinton is May 10 and the average first fall frost is October 5, giving a typical growing season of about 149 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 10
- Average first fall frost
- Oct 5
- Growing season
- 149 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 188 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 4 · May 24 · Jun 6 | Sep 12 · Sep 26 · Oct 8 | 125 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 10 · May 28 | Sep 24 · Oct 5 · Oct 21 | 149 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 29 · May 18 | Oct 3 · Oct 18 · Nov 3 | 171 days | 100% |
Planting calendar for Flinton
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 9 – Jun 15 |
| Tomatoes | Transplant outdoors | May 26 – Jun 15 |
| Peppers | Start seeds indoors | Apr 9 – May 10 |
| Peppers | Transplant outdoors | Jun 9 – Jul 10 |
| Eggplant | Start seeds indoors | Apr 26 – May 25 |
| Eggplant | Transplant outdoors | Jun 9 – Jul 10 |
| Cucumbers | Sow outdoors | Jun 9 – Jun 25 |
| Summer squash | Sow outdoors | May 26 – Jul 10 |
| Winter squash & pumpkins | Sow outdoors | Jun 9 – Jul 10 |
| Snap beans | Sow outdoors | May 26 – Jul 18 |
| Sweet corn | Sow outdoors | May 26 – Jun 15 |
| Watermelon & cantaloupe | Sow outdoors | Jun 9 – Jul 10 |
| Okra | Sow outdoors | Jun 2 – Jun 25 |
| Peas | Sow outdoors (spring) | Apr 9 – May 25 |
| Potatoes | Plant outdoors (spring) | Apr 9 – Jun 9 |
| Onions | Start seeds indoors (spring) | Feb 26 – Mar 25 |
| Onions | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (spring) | Mar 22 – Apr 25 |
| Broccoli | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (fall) | Jun 5 – Jun 15 |
| Broccoli | Transplant outdoors (fall) | Jul 5 – Jul 16 |
| Cabbage | Start seeds indoors (spring) | Mar 12 – Apr 9 |
| Cabbage | Transplant outdoors (spring) | Apr 9 – May 10 |
| Cabbage | Start seeds indoors (fall) | May 26 – Jun 25 |
| Cabbage | Transplant outdoors (fall) | Jun 25 – Jul 26 |
| Leaf lettuce | Sow outdoors (spring) | Apr 9 – Jun 25 |
| Leaf lettuce | Sow outdoors (fall) | Jun 25 – Aug 11 |
| Spinach | Sow outdoors (spring) | Apr 2 – May 16 |
| Spinach | Sow outdoors (fall) | Jul 12 – Aug 16 |
| Radishes | Sow outdoors (spring) | Apr 9 – May 30 |
| Radishes | Sow outdoors (fall) | Jun 25 – Aug 26 |
| Kale | Sow outdoors (spring) | Apr 26 – May 16 |
| Kale | Sow outdoors (fall) | Jun 18 – Jul 26 |
| Carrots | Sow outdoors (spring) | May 10 – Jun 25 |
| Carrots | Sow outdoors (fall) | May 26 – Jul 11 |
| Garlic | Plant outdoors (fall) | Sep 25 – Oct 26 |
Where these dates come from
ZIP code 16640 is matched to the NOAA station Prince Gallitzin Sp, PA, 4 km away, at 1,520 ft elevation (15 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Prince Gallitzin Sp, PA (used) | 1,520 ft | May 10 | Oct 5 |
| Altoona 3 W, PA | 1,320 ft | Apr 25 | Oct 21 |
| Ebensburg Sewage Plt, PA | 1,940 ft | May 17 | Oct 2 |
| Grampian 1E, PA | 1,510 ft | May 4 | Oct 13 |
Frost dates near Flinton
- Fallentimber, PA 16639 · last May 10, first Oct 5
- Coalport, PA 16627 · last May 10, first Oct 5
- Glasgow, PA 16644 · last May 10, first Oct 5
- Dysart, PA 16636 · last May 10, first Oct 5
- Patton, PA 16668 · last May 17, first Oct 2
- Saint Boniface, PA 16675 · last May 17, first Oct 2
- Blandburg, PA 16619 · last May 10, first Oct 5
- Irvona, PA 16656 · last May 10, first Oct 5
Frequently asked questions
- When is the last frost in Flinton, PA?
- For ZIP code 16640, the average last spring frost (32°F) is May 10, based on NOAA 1991-2020 climate normals for the Prince Gallitzin Sp, PA weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Flinton, PA?
- The average first fall frost (32°F) is October 5. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 16640?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 149 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.