Frost dates for 97414Broadbent, OR
The average last spring frost in Broadbent is March 21 and the average first fall frost is November 14, giving a typical growing season of about 241 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 21
- Average first fall frost
- Nov 14
- Growing season
- 241 days
Safer after Apr 12 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 13 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) | Mar 31 · Apr 20 · May 9 | Oct 1 · Oct 22 · Nov 14 | 183 days | 100% |
| Frost / freeze (32°F) | Feb 16 · Mar 21 · Apr 12 | Oct 21 · Nov 14 · Dec 14 | 241 days | 100% |
| Hard freeze (28°F) | Dec 17 · Feb 6 · Mar 18 | Nov 7 · Dec 9 · Jan 30 | 310 days | 92% |
Planting calendar for Broadbent
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 | Feb 18 – Apr 26 |
| Tomatoes | Transplant outdoors | Apr 6 – Jul 25 |
| Peppers | Start seeds indoors | Feb 18 – Mar 21 |
| Peppers | Transplant outdoors | Apr 20 – May 21 |
| Eggplant | Start seeds indoors | Mar 7 – Apr 5 |
| Eggplant | Transplant outdoors | Apr 20 – May 21 |
| Cucumbers | Sow outdoors | Apr 20 – Aug 4 |
| Summer squash | Sow outdoors | Apr 6 – May 21 |
| Winter squash & pumpkins | Sow outdoors | Apr 20 – May 21 |
| Snap beans | Sow outdoors | Apr 6 – Aug 27 |
| Sweet corn | Sow outdoors | Apr 6 – Jul 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 20 – May 21 |
| Okra | Sow outdoors | Apr 13 – May 6 |
| Peas | Sow outdoors (spring) | Feb 18 – Apr 5 |
| Potatoes | Plant outdoors (spring) | Feb 18 – Apr 20 |
| Onions | Start seeds indoors (spring) | Jan 7 – Feb 3 |
| Onions | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (spring) | Jan 31 – Mar 6 |
| Broccoli | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (fall) | Jul 15 – Jul 25 |
| Broccoli | Transplant outdoors (fall) | Aug 14 – Aug 25 |
| Cabbage | Start seeds indoors (spring) | Jan 21 – Feb 18 |
| Cabbage | Transplant outdoors (spring) | Feb 18 – Mar 21 |
| Cabbage | Start seeds indoors (fall) | Jul 5 – Aug 4 |
| Cabbage | Transplant outdoors (fall) | Aug 4 – Sep 4 |
| Leaf lettuce | Sow outdoors (spring) | Feb 18 – May 6 |
| Leaf lettuce | Sow outdoors (fall) | Aug 4 – Sep 20 |
| Spinach | Sow outdoors (spring) | Feb 11 – Mar 27 |
| Spinach | Sow outdoors (fall) | Aug 21 – Sep 25 |
| Radishes | Sow outdoors (spring) | Feb 18 – Apr 10 |
| Radishes | Sow outdoors (fall) | Aug 4 – Oct 5 |
| Kale | Sow outdoors (spring) | Mar 7 – Mar 27 |
| Kale | Sow outdoors (fall) | Jul 28 – Sep 4 |
| Carrots | Sow outdoors (spring) | Mar 21 – May 6 |
| Carrots | Sow outdoors (fall) | Jul 5 – Aug 20 |
| Garlic | Plant outdoors (fall) | Nov 4 – Dec 5 |
Where these dates come from
ZIP code 97414 is matched to the NOAA station Powers, OR, 11.5 km away, at 230 ft elevation (784 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Powers, OR (used) | 230 ft | Mar 21 | Nov 14 |
| Coquille City, OR | 23 ft | Mar 28 | Nov 6 |
| Langlois #2, OR | 90 ft | Mar 16 | Nov 29 |
| Bandon 2 Nne, OR | 23 ft | Mar 9 | Nov 27 |
Frost dates near Broadbent
- Myrtle Point, OR 97458 · last Mar 21, first Nov 14
- Powers, OR 97466 · last Mar 21, first Nov 14
- Coquille, OR 97423 · last Mar 28, first Nov 6
- Bandon, OR 97411 · last Mar 9, first Nov 27
- Coos Bay, OR 97420 · last Mar 28, first Nov 6
- Langlois, OR 97450 · last Mar 16, first Nov 29
- Sixes, OR 97476 · last Mar 16, first Nov 29
- Camas Valley, OR 97416 · last Mar 31, first Nov 6
Frequently asked questions
- When is the last frost in Broadbent, OR?
- For ZIP code 97414, the average last spring frost (32°F) is March 21, based on NOAA 1991-2020 climate normals for the Powers, OR weather station. There is a 1-in-10 chance of a frost after April 12.
- When is the first frost in Broadbent, OR?
- The average first fall frost (32°F) is November 14. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 97414?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 241 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.