Frost dates for 97484Tiller, OR
The average last spring frost in Tiller is May 19 and the average first fall frost is October 3, giving a typical growing season of about 136 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Oct 3
- Growing season
- 136 days
Safer after Jun 9 (1-in-10 risk)
Possible by Sep 13 (1-in-10 risk)
Last frost typically in 198 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 22 · Jun 11 · Jun 28 | Aug 29 · Sep 14 · Oct 1 | 95 days | 100% |
| Frost / freeze (32°F) | Apr 29 · May 19 · Jun 9 | Sep 13 · Oct 3 · Oct 20 | 136 days | 100% |
| Hard freeze (28°F) | Apr 1 · Apr 26 · May 16 | Oct 4 · Oct 24 · Nov 18 | 182 days | 100% |
Planting calendar for Tiller
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 13 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 23 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 16 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 13 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | Jun 3 – Jun 13 |
| Broccoli | Transplant outdoors (fall) | Jul 3 – Jul 14 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 24 – Jun 23 |
| Cabbage | Transplant outdoors (fall) | Jun 23 – Jul 24 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 23 – Aug 9 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 10 – Aug 14 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 23 – Aug 24 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 16 – Jul 24 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 24 – Jul 9 |
| Garlic | Plant outdoors (fall) | Sep 23 – Oct 24 |
Where these dates come from
ZIP code 97484 is matched to the NOAA station Prospect 2 Sw, OR, 37.9 km away, at 2,482 ft elevation (143 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Prospect 2 Sw, OR (used) | 2,482 ft | May 19 | Oct 3 |
| Lost Creek Dam, OR | 1,580 ft | Apr 29 | Oct 17 |
| Riddle, OR | 680 ft | Mar 31 | Nov 6 |
| Roseburg Kqen, OR | 425 ft | Mar 23 | Nov 18 |
Frost dates near Tiller
- Days Creek, OR 97429 · last Mar 31, first Nov 6
- Azalea, OR 97410 · last Apr 29, first Oct 17
- Trail, OR 97541 · last May 19, first Oct 3
- Canyonville, OR 97417 · last Mar 31, first Nov 6
- Myrtle Creek, OR 97457 · last Mar 31, first Nov 6
- Shady Cove, OR 97539 · last Apr 29, first Oct 17
- Riddle, OR 97469 · last Mar 31, first Nov 6
- Prospect, OR 97536 · last May 19, first Oct 3
Frequently asked questions
- When is the last frost in Tiller, OR?
- For ZIP code 97484, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Prospect 2 Sw, OR weather station. There is a 1-in-10 chance of a frost after June 9.
- When is the first frost in Tiller, OR?
- The average first fall frost (32°F) is October 3. There is a 1-in-10 chance of frost by September 13, so tender plants are at risk from that point on.
- How long is the growing season in 97484?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 136 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.