Frost dates for 99323Burbank, WA
The average last spring frost in Burbank is April 7 and the average first fall frost is October 22, giving a typical growing season of about 199 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 7
- Average first fall frost
- Oct 22
- Growing season
- 199 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 6 (1-in-10 risk)
Last frost typically in 156 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 9 · Apr 25 · May 11 | Sep 27 · Oct 10 · Oct 26 | 168 days | 100% |
| Frost / freeze (32°F) | Mar 20 · Apr 7 · Apr 30 | Oct 6 · Oct 22 · Nov 9 | 199 days | 100% |
| Hard freeze (28°F) | Mar 1 · Mar 18 · Apr 7 | Oct 18 · Nov 4 · Nov 25 | 230 days | 100% |
Planting calendar for Burbank
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 7 – May 13 |
| Tomatoes | Transplant outdoors | Apr 23 – Jul 2 |
| Peppers | Start seeds indoors | Mar 7 – Apr 7 |
| Peppers | Transplant outdoors | May 7 – Jun 7 |
| Eggplant | Start seeds indoors | Mar 24 – Apr 22 |
| Eggplant | Transplant outdoors | May 7 – Jun 7 |
| Cucumbers | Sow outdoors | May 7 – Jul 12 |
| Summer squash | Sow outdoors | Apr 23 – Jun 7 |
| Winter squash & pumpkins | Sow outdoors | May 7 – Jun 7 |
| Snap beans | Sow outdoors | Apr 23 – Aug 4 |
| Sweet corn | Sow outdoors | Apr 23 – Jul 2 |
| Watermelon & cantaloupe | Sow outdoors | May 7 – Jun 7 |
| Okra | Sow outdoors | Apr 30 – May 23 |
| Peas | Sow outdoors (spring) | Mar 7 – Apr 22 |
| Potatoes | Plant outdoors (spring) | Mar 7 – May 7 |
| Onions | Start seeds indoors (spring) | Jan 24 – Feb 20 |
| Onions | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (spring) | Feb 17 – Mar 23 |
| Broccoli | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (fall) | Jun 22 – Jul 2 |
| Broccoli | Transplant outdoors (fall) | Jul 22 – Aug 2 |
| Cabbage | Start seeds indoors (spring) | Feb 7 – Mar 7 |
| Cabbage | Transplant outdoors (spring) | Mar 7 – Apr 7 |
| Cabbage | Start seeds indoors (fall) | Jun 12 – Jul 12 |
| Cabbage | Transplant outdoors (fall) | Jul 12 – Aug 12 |
| Leaf lettuce | Sow outdoors (spring) | Mar 7 – May 23 |
| Leaf lettuce | Sow outdoors (fall) | Jul 12 – Aug 28 |
| Spinach | Sow outdoors (spring) | Feb 28 – Apr 13 |
| Spinach | Sow outdoors (fall) | Jul 29 – Sep 2 |
| Radishes | Sow outdoors (spring) | Mar 7 – Apr 27 |
| Radishes | Sow outdoors (fall) | Jul 12 – Sep 12 |
| Kale | Sow outdoors (spring) | Mar 24 – Apr 13 |
| Kale | Sow outdoors (fall) | Jul 5 – Aug 12 |
| Carrots | Sow outdoors (spring) | Apr 7 – May 23 |
| Carrots | Sow outdoors (fall) | Jun 12 – Jul 28 |
| Garlic | Plant outdoors (fall) | Oct 12 – Nov 12 |
Where these dates come from
ZIP code 99323 is matched to the NOAA station Ice Harbor Dam, WA, 5.6 km away, at 368 ft elevation (203 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ice Harbor Dam, WA (used) | 368 ft | Apr 7 | Oct 22 |
| Kennewick, WA | 390 ft | Mar 28 | Oct 30 |
| Pasco Tri Cities Ap, WA | 407 ft | Apr 27 | Oct 11 |
| Sagemoor, WA | 595 ft | Apr 30 | Oct 13 |
Frost dates near Burbank
- Wallula, WA 99363 · last Apr 7, first Oct 22
- Pasco, WA 99302 · last Mar 28, first Oct 30
- Kennewick, WA 99337 · last Mar 28, first Oct 30
- Touchet, WA 99360 · last May 2, first Oct 1
- Richland, WA 99352 · last Apr 6, first Oct 24
- Eltopia, WA 99330 · last Apr 21, first Oct 22
- West Richland, WA 99353 · last Apr 6, first Oct 24
- Helix, OR 97835 · last May 12, first Sep 27
Frequently asked questions
- When is the last frost in Burbank, WA?
- For ZIP code 99323, the average last spring frost (32°F) is April 7, based on NOAA 1991-2020 climate normals for the Ice Harbor Dam, WA weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Burbank, WA?
- The average first fall frost (32°F) is October 22. There is a 1-in-10 chance of frost by October 6, so tender plants are at risk from that point on.
- How long is the growing season in 99323?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 199 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.