Frost dates for 97442Glendale, OR
The average last spring frost in Glendale is May 16 and the average first fall frost is October 30, giving a typical growing season of about 164 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 16
- Average first fall frost
- Oct 30
- Growing season
- 164 days
Safer after Jun 7 (1-in-10 risk)
Possible by Oct 8 (1-in-10 risk)
Last frost typically in 195 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 16 · Jun 7 · Jun 25 | Sep 15 · Oct 9 · Nov 1 | 122 days | 100% |
| Frost / freeze (32°F) | Apr 23 · May 16 · Jun 7 | Oct 8 · Oct 30 · Nov 17 | 164 days | 100% |
| Hard freeze (28°F) | Mar 23 · Apr 23 · May 17 | Oct 28 · Nov 17 · Dec 10 | 211 days | 100% |
Planting calendar for Glendale
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 15 – Jun 21 |
| Tomatoes | Transplant outdoors | Jun 1 – Jul 10 |
| Peppers | Start seeds indoors | Apr 15 – May 16 |
| Peppers | Transplant outdoors | Jun 15 – Jul 16 |
| Eggplant | Start seeds indoors | May 2 – May 31 |
| Eggplant | Transplant outdoors | Jun 15 – Jul 16 |
| Cucumbers | Sow outdoors | Jun 15 – Jul 20 |
| Summer squash | Sow outdoors | Jun 1 – Jul 16 |
| Winter squash & pumpkins | Sow outdoors | Jun 15 – Jul 16 |
| Snap beans | Sow outdoors | Jun 1 – Aug 12 |
| Sweet corn | Sow outdoors | Jun 1 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | Jun 15 – Jul 16 |
| Okra | Sow outdoors | Jun 8 – Jul 1 |
| Peas | Sow outdoors (spring) | Apr 15 – May 31 |
| Potatoes | Plant outdoors (spring) | Apr 15 – Jun 15 |
| Onions | Start seeds indoors (spring) | Mar 4 – Mar 31 |
| Onions | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (spring) | Mar 28 – May 1 |
| Broccoli | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Mar 18 – Apr 15 |
| Cabbage | Transplant outdoors (spring) | Apr 15 – May 16 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Apr 15 – Jul 1 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Apr 8 – May 22 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Apr 15 – Jun 5 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | May 2 – May 22 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | May 16 – Jul 1 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 97442 is matched to the NOAA station Sexton Summit, OR, 17 km away, at 3,832 ft elevation (1,431 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sexton Summit, OR (used) | 3,832 ft | May 16 | Oct 30 |
| Riddle, OR | 680 ft | Mar 31 | Nov 6 |
| Grants Pass, OR | 932 ft | Apr 8 | Oct 28 |
| Roseburg Kqen, OR | 425 ft | Mar 23 | Nov 18 |
Frost dates near Glendale
- Wolf Creek, OR 97497 · last Apr 8, first Oct 28
- Riddle, OR 97469 · last Mar 31, first Nov 6
- Canyonville, OR 97417 · last Mar 31, first Nov 6
- Azalea, OR 97410 · last Apr 29, first Oct 17
- Merlin, OR 97532 · last Apr 8, first Oct 28
- Myrtle Creek, OR 97457 · last Mar 31, first Nov 6
- Grants Pass, OR 97526 · last Apr 8, first Oct 28
- Days Creek, OR 97429 · last Mar 31, first Nov 6
Frequently asked questions
- When is the last frost in Glendale, OR?
- For ZIP code 97442, the average last spring frost (32°F) is May 16, based on NOAA 1991-2020 climate normals for the Sexton Summit, OR weather station. There is a 1-in-10 chance of a frost after June 7.
- When is the first frost in Glendale, OR?
- The average first fall frost (32°F) is October 30. There is a 1-in-10 chance of frost by October 8, so tender plants are at risk from that point on.
- How long is the growing season in 97442?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 164 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.