Frost dates for 97355Lebanon, OR
The average last spring frost in Lebanon is April 26 and the average first fall frost is October 24, giving a typical growing season of about 184 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 26
- Average first fall frost
- Oct 24
- Growing season
- 184 days
Safer after May 11 (1-in-10 risk)
Possible by Oct 5 (1-in-10 risk)
Last frost typically in 176 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) | Apr 30 · May 14 · Jun 1 | Sep 15 · Oct 5 · Oct 27 | 143 days | 100% |
| Frost / freeze (32°F) | Apr 4 · Apr 26 · May 11 | Oct 5 · Oct 24 · Nov 14 | 184 days | 100% |
| Hard freeze (28°F) | Feb 21 · Mar 24 · Apr 19 | Oct 22 · Nov 12 · Dec 12 | 237 days | 100% |
Planting calendar for Lebanon
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 | Mar 26 – Jun 1 |
| Tomatoes | Transplant outdoors | May 12 – Jul 4 |
| Peppers | Start seeds indoors | Mar 26 – Apr 26 |
| Peppers | Transplant outdoors | May 26 – Jun 26 |
| Eggplant | Start seeds indoors | Apr 12 – May 11 |
| Eggplant | Transplant outdoors | May 26 – Jun 26 |
| Cucumbers | Sow outdoors | May 26 – Jul 14 |
| Summer squash | Sow outdoors | May 12 – Jun 26 |
| Winter squash & pumpkins | Sow outdoors | May 26 – Jun 26 |
| Snap beans | Sow outdoors | May 12 – Aug 6 |
| Sweet corn | Sow outdoors | May 12 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 26 – Jun 26 |
| Okra | Sow outdoors | May 19 – Jun 11 |
| Peas | Sow outdoors (spring) | Mar 26 – May 11 |
| Potatoes | Plant outdoors (spring) | Mar 26 – May 26 |
| Onions | Start seeds indoors (spring) | Feb 12 – Mar 11 |
| Onions | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (spring) | Mar 8 – Apr 11 |
| Broccoli | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Feb 26 – Mar 26 |
| Cabbage | Transplant outdoors (spring) | Mar 26 – Apr 26 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 26 – Jun 11 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 19 – May 2 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 26 – May 16 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Apr 12 – May 2 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 26 – Jun 11 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 97355 is matched to the NOAA station Lacomb 3 Nne, OR, 16.6 km away, at 520 ft elevation (74 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Lacomb 3 Nne, OR (used) | 520 ft | Apr 26 | Oct 24 |
| Lebanon, OR | 330 ft | Mar 14 | Nov 18 |
| Foster Dam, OR | 550 ft | Apr 12 | Oct 28 |
| Corvallis State Univ, OR | 225 ft | Apr 17 | Oct 28 |
Frost dates near Lebanon
- Crabtree, OR 97335 · last Apr 26, first Oct 24
- Albany, OR 97322 · last Apr 17, first Oct 28
- Brownsville, OR 97327 · last Apr 12, first Oct 28
- Tangent, OR 97389 · last Apr 17, first Oct 28
- Sweet Home, OR 97386 · last Apr 12, first Oct 28
- Crawfordsville, OR 97336 · last Apr 12, first Oct 28
- Shedd, OR 97377 · last Apr 17, first Oct 28
- Scio, OR 97374 · last Mar 29, first Nov 6
Frequently asked questions
- When is the last frost in Lebanon, OR?
- For ZIP code 97355, the average last spring frost (32°F) is April 26, based on NOAA 1991-2020 climate normals for the Lacomb 3 Nne, OR weather station. There is a 1-in-10 chance of a frost after May 11.
- When is the first frost in Lebanon, OR?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 5, so tender plants are at risk from that point on.
- How long is the growing season in 97355?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 184 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.