Frost Dates for Kirkland, WA 98033
Kirkland has 2 ZIP codes. The Kirkland, WA frost page lists all of them with their dates.
Last spring frost April 10 · First fall frost October 26 · 199 frost-free days · USDA Zone 9a
ZIP 98033 has about 41,000 people, one of 2 ZIP codes in Kirkland.
Long season: 199 frost-free days. Spring frost risk spans March 14–April 30 (47 days). Fall frost risk spans October 7–November 17 (41 days).
Frost probability for 98033
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 30 | April 10 | March 14 |
| Fall (first frost) | October 7 | October 26 | November 17 |
Dates come from NOAA 1971–2000 freeze probabilities at KENT (29.0 km away); the 50% date is the median year.
Which crops fit a 199-day season in Kirkland
In Kirkland (199 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Mar 6 | Apr 24–May 1 | 157 | fits: 80 days to maturity, 157 available after Apr 24. | Jun 26 |
| Pepper | Feb 27 | Apr 24–May 1 | 157 | fits: 75 days to maturity, 157 available after Apr 24. | Jul 1 |
| Lettuce | Feb 13 | Mar 13–Mar 20 | 234 | two-plantings: Plant Mar 13 and again by Sep 4; both mature before Nov 2. | Sep 4 |
| Carrots | — | Mar 20–Mar 27 | 241 | fits: 70 days to maturity, 241 available after Mar 20. | Aug 24 |
| Cucumber | Mar 20 | Apr 24–May 1 | 171 | two-plantings: Plant Apr 24 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Beans | — | Apr 17–May 1 | 185 | two-plantings: Plant Apr 17 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Peas | — | Feb 13–Apr 24 | 262 | fits: 65 days to maturity, 262 available after Feb 13. | Aug 15 |
| Zucchini | Mar 27 | Apr 24–May 1 | 171 | two-plantings: Plant Apr 24 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Onion | Jan 16 | Mar 13–Mar 27 | 234 | fits: 100 days to maturity, 234 available after Mar 13. | — |
| Spinach | — | Feb 13–Apr 3 | 276 | two-plantings: Plant Feb 13 and again by Sep 23; both mature before Nov 16. | Sep 23 |
| Kale | Jan 30 | Mar 13–Mar 27 | 248 | two-plantings: Plant Mar 13 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Broccoli | Feb 13 | Mar 13–Mar 27 | 234 | fits: 80 days to maturity, 234 available after Mar 13. | Jul 31 |
| Cabbage | Feb 13 | Mar 13–Mar 27 | 248 | fits: 70 days to maturity, 248 available after Mar 13. | Aug 24 |
| Radish | — | Feb 13–May 8 | 262 | two-plantings: Plant Feb 13 and again by Sep 24; both mature before Nov 2. | Sep 24 |
| Beets | — | Feb 13–May 8 | 262 | two-plantings: Plant Feb 13 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Potatoes | — | Mar 27–Apr 3 | 220 | fits: 90 days to maturity, 220 available after Mar 27. | — |
| Garlic | — | Oct 26 | 304 | overwinter: Plant Oct 26 to Nov 16; harvest the following summer. | Nov 16 |
| Strawberry | — | Mar 6–May 1 | 255 | perennial: A perennial: plant Mar 6; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 13 | Apr 17–Apr 24 | 171 | fits: 75 days to maturity, 171 available after Apr 17. | Jul 8 |
| Pumpkin | Mar 27 | Apr 24–Apr 24 | 164 | fits: 100 days to maturity, 164 available after Apr 24. | Jun 13 |
| Cauliflower | Feb 27 | Apr 3–Apr 17 | 213 | fits: 75 days to maturity, 213 available after Apr 3. | Aug 5 |
| Swiss Chard | Feb 13 | Mar 27–Mar 27 | 220 | two-plantings: Plant Mar 27 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Arugula | — | Feb 13–May 8 | 276 | two-plantings: Plant Feb 13 and again by Sep 23; both mature before Nov 16. | Sep 23 |
| Brussel Sprouts | Feb 13 | Mar 13–Mar 27 | 248 | fits: 100 days to maturity, 248 available after Mar 13. | Jul 25 |
| Butternut Squash | Mar 27 | Apr 24–May 1 | 164 | fits: 100 days to maturity, 164 available after Apr 24. | Jun 13 |
| Eggplant | Feb 20 | Apr 24–May 1 | 157 | fits: 70 days to maturity, 157 available after Apr 24. | Jul 6 |
| Okra | Mar 13 | Apr 17–Apr 24 | 178 | two-plantings: Plant Apr 17 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Basil | Mar 6 | May 1–May 1 | 164 | two-plantings: Plant May 1 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Cilantro | — | Mar 13–Apr 3 | 234 | two-plantings: Plant Mar 13 and again by Aug 30; both mature before Nov 2. | Aug 30 |
| Parsley | Jan 30 | Apr 17–Apr 24 | 199 | fits: 70 days to maturity, 199 available after Apr 17. | Aug 10 |
| Celery | Jan 30 | Apr 17–May 1 | 199 | fits: 120 days to maturity, 199 available after Apr 17. | Jun 21 |
| Scallions | Jan 30 | Mar 13–Mar 27 | 248 | two-plantings: Plant Mar 13 and again by Sep 3; both mature before Nov 16. | Sep 3 |
| Turnip | — | Mar 13–Mar 27 | 248 | two-plantings: Plant Mar 13 and again by Sep 13; both mature before Nov 16. | Sep 13 |
| Kohlrabi | — | Feb 27–Mar 13 | 262 | two-plantings: Plant Feb 27 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Bok Choy | Mar 13 | Apr 3–Apr 10 | 213 | two-plantings: Plant Apr 3 and again by Sep 4; both mature before Nov 2. | Sep 4 |
| Collards | Jan 30 | Mar 13–Mar 27 | 248 | two-plantings: Plant Mar 13 and again by Sep 3; both mature before Nov 16. | Sep 3 |
| Cantaloupe | Mar 27 | Apr 24–May 1 | 157 | fits: 85 days to maturity, 157 available after Apr 24. | Jun 21 |
| Chives | Jan 16 | Apr 17–Apr 24 | 213 | fits: 90 days to maturity, 213 available after Apr 17. | — |
| Dill | — | Feb 13–May 8 | 262 | two-plantings: Plant Feb 13 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Oregano | Jan 30 | Apr 17–Apr 24 | 213 | fits: 80 days to maturity, 213 available after Apr 17. | — |
| Rosemary | Jan 16 | Apr 17–Apr 24 | 199 | fits: 80 days to maturity, 199 available after Apr 17. | — |
| Sage | Feb 13 | Apr 17–Apr 24 | 213 | fits: 75 days to maturity, 213 available after Apr 17. | — |
| Thyme | Jan 30 | Apr 17–Apr 24 | 213 | fits: 90 days to maturity, 213 available after Apr 17. | — |
| Calendula | Feb 27 | Mar 27–Apr 10 | 220 | two-plantings: Plant Mar 27 and again by Aug 30; both mature before Nov 2. | Aug 30 |
| Cosmos | Mar 13 | Apr 10–Apr 24 | 185 | two-plantings: Plant Apr 10 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Lavender | Jan 16 | Apr 10–Apr 24 | 220 | fits: 90 days to maturity, 220 available after Apr 10. | — |
| Marigolds | Feb 27 | Apr 10–Apr 17 | 185 | two-plantings: Plant Apr 10 and again by Aug 9; both mature before Oct 12. | Aug 9 |
| Melons | Mar 27 | Apr 24–May 1 | 157 | fits: 85 days to maturity, 157 available after Apr 24. | Jun 21 |
| Mint | — | Apr 10–Apr 24 | 220 | fits: 90 days to maturity, 220 available after Apr 10. | — |
| Nasturtiums | Mar 13 | Apr 10–Apr 17 | 185 | two-plantings: Plant Apr 10 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Pole Beans | — | Apr 17–May 1 | 178 | fits: 65 days to maturity, 178 available after Apr 17. | Jul 25 |
| Spaghetti Squash | Mar 27 | Apr 24–May 1 | 164 | fits: 90 days to maturity, 164 available after Apr 24. | Jun 23 |
| Sunflowers | — | Apr 10–Apr 24 | 185 | fits: 70 days to maturity, 185 available after Apr 10. | Jul 20 |
| Tomatillos | Feb 13 | Apr 17–Apr 24 | 164 | fits: 75 days to maturity, 164 available after Apr 17. | Jul 1 |
| Watermelon | Mar 27 | Apr 17–Apr 24 | 164 | fits: 80 days to maturity, 164 available after Apr 17. | Jun 26 |
| Yellow Squash | Mar 27 | Apr 24–May 1 | 171 | two-plantings: Plant Apr 24 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Zinnias | Mar 13 | Apr 10–Apr 24 | 185 | two-plantings: Plant Apr 10 and again by Jul 30; both mature before Oct 12. | Jul 30 |
Month by month in Kirkland
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 16), Lavender (Jan 16), Onion (Jan 16), Rosemary (Jan 16), Celery (Jan 30), Collards (Jan 30), +5 more. |
| February | Start indoors: Broccoli (Feb 13), Brussel Sprouts (Feb 13), Cabbage (Feb 13), Lettuce (Feb 13), Sage (Feb 13), Swiss Chard (Feb 13), +6 more. Direct sow from: Arugula (Feb 13), Beets (Feb 13), Dill (Feb 13), Peas (Feb 13), Radish (Feb 13), Spinach (Feb 13), +1 more. |
| March | Start indoors: Basil (Mar 6), Tomato (Mar 6), Bok Choy (Mar 13), Corn (Mar 13), Cosmos (Mar 13), Nasturtiums (Mar 13), +11 more. Direct sow from: Cilantro (Mar 13), Turnip (Mar 13), Carrots (Mar 20), Potatoes (Mar 27). Transplant from: Broccoli (Mar 13), Brussel Sprouts (Mar 13), Cabbage (Mar 13), Collards (Mar 13), Kale (Mar 13), Lettuce (Mar 13), +4 more. Plant: Strawberry (Mar 6). |
| April | Direct sow from: Sunflowers (Apr 10), Beans (Apr 17), Pole Beans (Apr 17). Transplant from: Bok Choy (Apr 3), Cauliflower (Apr 3), Cosmos (Apr 10), Lavender (Apr 10), Marigolds (Apr 10), Mint (Apr 10), +24 more. Last frost around April 10. |
| May | Transplant from: Basil (May 1). |
| June | Last sowing dates: Butternut Squash (Jun 13), Pumpkin (Jun 13), Cantaloupe (Jun 21), Celery (Jun 21), Melons (Jun 21), Spaghetti Squash (Jun 23), +2 more. |
| July | Last sowing dates: Pepper (Jul 1), Tomatillos (Jul 1), Eggplant (Jul 6), Corn (Jul 8), Sunflowers (Jul 20), Brussel Sprouts (Jul 25), +6 more. |
| August | Last sowing dates: Nasturtiums (Aug 4), Okra (Aug 4), Yellow Squash (Aug 4), Zucchini (Aug 4), Cauliflower (Aug 5), Beans (Aug 6), +10 more. |
| September | Last sowing dates: Collards (Sep 3), Scallions (Sep 3), Bok Choy (Sep 4), Lettuce (Sep 4), Kale (Sep 8), Kohlrabi (Sep 8), +4 more. |
| October | Direct sow from: Garlic (Oct 26). First frost around October 26. |
| November | Last sowing dates: Garlic (Nov 16). |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Kirkland, WA (ZIP 98033)?
The median last spring frost date for Kirkland, WA (ZIP code 98033) is around April 10. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before March 14; one in ten it runs past April 30.
What is the first fall frost date in Kirkland, WA?
The median first fall frost date for Kirkland, WA is around October 26. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around October 7 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Kirkland, WA?
The frost-free growing season in Kirkland is about 199 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Kirkland (199 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Kirkland, WA?
Kirkland, WA is in USDA hardiness zone 9a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Kirkland, WA?
Start tomatoes indoors Mar 6 and plant out Apr 24 in Kirkland. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Kirkland?
Two: plant Mar 13 and again by Sep 4; both mature before Nov 2.
When do I plant garlic in Kirkland?
Oct 26 to Nov 16; it overwinters and is ready the following summer.
Can I get two tomato crops in Kirkland?
Yes: plant out Apr 24 for a summer crop, and set out a second round of transplants by Jun 26 for a fall crop.
Nearby and related
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