Frost dates for 98046Lynnwood, WA
The average last spring frost in Lynnwood is March 9 and the average first fall frost is November 17, giving a typical growing season of about 250 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 9
- Average first fall frost
- Nov 17
- Growing season
- 250 days
Safer after Mar 29 (1-in-10 risk)
Possible by Oct 31 (1-in-10 risk)
First frost typically in 15 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 15 · Apr 3 · Apr 27 | Oct 19 · Nov 2 · Nov 20 | 211 days | 100% |
| Frost / freeze (32°F) | Feb 15 · Mar 9 · Mar 29 | Oct 31 · Nov 17 · Dec 7 | 250 days | 100% |
| Hard freeze (28°F) | Jan 1 · Feb 13 · Mar 9 | Nov 15 · Dec 6 · Jan 8 | 300 days | 98% |
Planting calendar for Lynnwood
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 6 – Apr 14 |
| Tomatoes | Transplant outdoors | Mar 25 – Jul 28 |
| Peppers | Start seeds indoors | Feb 6 – Mar 9 |
| Peppers | Transplant outdoors | Apr 8 – May 9 |
| Eggplant | Start seeds indoors | Feb 23 – Mar 24 |
| Eggplant | Transplant outdoors | Apr 8 – May 9 |
| Cucumbers | Sow outdoors | Apr 8 – Aug 7 |
| Summer squash | Sow outdoors | Mar 25 – May 9 |
| Winter squash & pumpkins | Sow outdoors | Apr 8 – May 9 |
| Snap beans | Sow outdoors | Mar 25 – Aug 30 |
| Sweet corn | Sow outdoors | Mar 25 – Jul 28 |
| Watermelon & cantaloupe | Sow outdoors | Apr 8 – May 9 |
| Okra | Sow outdoors | Apr 1 – Apr 24 |
| Peas | Sow outdoors (spring) | Feb 6 – Mar 24 |
| Potatoes | Plant outdoors (spring) | Feb 6 – Apr 8 |
| Onions | Start seeds indoors (spring) | Dec 26 – Jan 22 |
| Onions | Transplant outdoors (spring) | Feb 23 – Mar 24 |
| Broccoli | Start seeds indoors (spring) | Jan 19 – Feb 22 |
| Broccoli | Transplant outdoors (spring) | Feb 23 – Mar 24 |
| Broccoli | Start seeds indoors (fall) | Jul 18 – Jul 28 |
| Broccoli | Transplant outdoors (fall) | Aug 17 – Aug 28 |
| Cabbage | Start seeds indoors (spring) | Jan 9 – Feb 6 |
| Cabbage | Transplant outdoors (spring) | Feb 6 – Mar 9 |
| Cabbage | Start seeds indoors (fall) | Jul 8 – Aug 7 |
| Cabbage | Transplant outdoors (fall) | Aug 7 – Sep 7 |
| Leaf lettuce | Sow outdoors (spring) | Feb 6 – Apr 24 |
| Leaf lettuce | Sow outdoors (fall) | Aug 7 – Sep 23 |
| Spinach | Sow outdoors (spring) | Jan 30 – Mar 15 |
| Spinach | Sow outdoors (fall) | Aug 24 – Sep 28 |
| Radishes | Sow outdoors (spring) | Feb 6 – Mar 29 |
| Radishes | Sow outdoors (fall) | Aug 7 – Oct 8 |
| Kale | Sow outdoors (spring) | Feb 23 – Mar 15 |
| Kale | Sow outdoors (fall) | Jul 31 – Sep 7 |
| Carrots | Sow outdoors (spring) | Mar 9 – Apr 24 |
| Carrots | Sow outdoors (fall) | Jul 8 – Aug 23 |
| Garlic | Plant outdoors (fall) | Nov 7 – Dec 8 |
Where these dates come from
ZIP code 98046 is matched to the NOAA station Everett Snohomish Ap, WA, 10 km away, at 606 ft elevation (212 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Everett Snohomish Ap, WA (used) | 606 ft | Mar 9 | Nov 17 |
| Seattle Sand Pt Wsfo, WA | 60 ft | Mar 8 | Nov 23 |
| Everett, WA | 60 ft | Mar 24 | Nov 2 |
| Monroe, WA | 120 ft | Apr 17 | Oct 23 |
Frost dates near Lynnwood
- Edmonds, WA 98026 · last Mar 9, first Nov 17
- Lynnwood, WA 98036 · last Mar 9, first Nov 17
- Mountlake Terrace, WA 98043 · last Mar 9, first Nov 17
- Everett, WA 98206 · last Mar 9, first Nov 17
- Seattle, WA 98155 · last Mar 8, first Nov 23
- Bothell, WA 98021 · last Mar 8, first Nov 23
- Kenmore, WA 98028 · last Mar 8, first Nov 23
- Mill Creek, WA 98082 · last Mar 9, first Nov 17
Frequently asked questions
- When is the last frost in Lynnwood, WA?
- For ZIP code 98046, the average last spring frost (32°F) is March 9, based on NOAA 1991-2020 climate normals for the Everett Snohomish Ap, WA weather station. There is a 1-in-10 chance of a frost after March 29.
- When is the first frost in Lynnwood, WA?
- The average first fall frost (32°F) is November 17. There is a 1-in-10 chance of frost by October 31, so tender plants are at risk from that point on.
- How long is the growing season in 98046?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 250 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.