Frost Dates for Leavenworth, WA 98826
Last spring frost May 29 · First fall frost September 15 · 109 frost-free days · USDA Zone 7a
ZIP 98826 has about 7,610 people.
Short season: 109 frost-free days. Spring frost risk spans May 10–June 18 (39 days). Fall frost risk spans September 1–September 29 (28 days).
Frost probability for 98826
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 18 | May 29 | May 10 |
| Fall (first frost) | September 1 | September 15 | September 29 |
Dates come from NOAA 1971–2000 freeze probabilities at PLAIN (15.0 km away); the 50% date is the median year.
Which crops fit a 109-day season in Leavenworth
In Leavenworth (109 frost-free days, a short season), 29 of 56 planner crops fit outright, 15 get two plantings, 9 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 24 | Jun 12–Jun 19 | 67 | head-start: Even planted out Jun 12, the outdoor season is about 13 days short; choose an early variety or grow under cover. | — |
| Pepper | Apr 17 | Jun 12–Jun 19 | 67 | head-start: Even planted out Jun 12, the outdoor season is about 8 days short; choose an early variety or grow under cover. | — |
| Lettuce | Apr 3 | May 1–May 8 | 144 | two-plantings: Plant May 1 and again by Jul 25; both mature before Sep 22. | Jul 25 |
| Carrots | — | May 8–May 15 | 151 | fits: 70 days to maturity, 151 available after May 8. | Jul 14 |
| Cucumber | May 8 | Jun 12–Jun 19 | 81 | fits: 60 days to maturity, 81 available after Jun 12. | Jun 19 |
| Beans | — | Jun 5–Jun 19 | 95 | fits: 60 days to maturity, 95 available after Jun 5. | Jun 26 |
| Peas | — | Apr 3–Jun 12 | 172 | fits: 65 days to maturity, 172 available after Apr 3. | Jul 5 |
| Zucchini | May 15 | Jun 12–Jun 19 | 81 | fits: 55 days to maturity, 81 available after Jun 12. | Jun 24 |
| Onion | Mar 6 | May 1–May 15 | 144 | fits: 100 days to maturity, 144 available after May 1. | — |
| Spinach | — | Apr 3–May 22 | 186 | two-plantings: Plant Apr 3 and again by Aug 13; both mature before Oct 6. | Aug 13 |
| Kale | Mar 20 | May 1–May 15 | 158 | two-plantings: Plant May 1 and again by Jul 29; both mature before Oct 6. | Jul 29 |
| Broccoli | Apr 3 | May 1–May 15 | 144 | fits: 80 days to maturity, 144 available after May 1. | Jun 20 |
| Cabbage | Apr 3 | May 1–May 15 | 158 | fits: 70 days to maturity, 158 available after May 1. | Jul 14 |
| Radish | — | Apr 3–Jun 26 | 172 | two-plantings: Plant Apr 3 and again by Aug 14; both mature before Sep 22. | Aug 14 |
| Beets | — | Apr 3–Jun 26 | 172 | two-plantings: Plant Apr 3 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Potatoes | — | May 15–May 22 | 130 | fits: 90 days to maturity, 130 available after May 15. | — |
| Garlic | — | Sep 15 | 214 | overwinter: Plant Sep 15 to Oct 6; harvest the following summer. | Oct 6 |
| Strawberry | — | Apr 24–Jun 19 | 165 | perennial: A perennial: plant Apr 24; it fruits from the following year and keeps producing for several years. | — |
| Corn | May 1 | Jun 5–Jun 12 | 81 | fits: 75 days to maturity, 81 available after Jun 5. | — |
| Pumpkin | May 15 | Jun 12–Jun 12 | 74 | no-fit: Needs 100 days; Leavenworth has 74 after Jun 12. | — |
| Cauliflower | Apr 17 | May 22–Jun 5 | 123 | fits: 75 days to maturity, 123 available after May 22. | Jun 25 |
| Swiss Chard | Apr 3 | May 15–May 15 | 130 | two-plantings: Plant May 15 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Arugula | — | Apr 3–Jun 26 | 186 | two-plantings: Plant Apr 3 and again by Aug 13; both mature before Oct 6. | Aug 13 |
| Brussel Sprouts | Apr 3 | May 1–May 15 | 158 | fits: 100 days to maturity, 158 available after May 1. | Jun 14 |
| Butternut Squash | May 15 | Jun 12–Jun 19 | 74 | no-fit: Needs 100 days; Leavenworth has 74 after Jun 12. | — |
| Eggplant | Apr 10 | Jun 12–Jun 19 | 67 | head-start: Even planted out Jun 12, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Okra | May 1 | Jun 5–Jun 12 | 88 | fits: 55 days to maturity, 88 available after Jun 5. | Jun 24 |
| Basil | Apr 24 | Jun 19–Jun 19 | 74 | fits: 60 days to maturity, 74 available after Jun 19. | — |
| Cilantro | — | May 1–May 22 | 144 | two-plantings: Plant May 1 and again by Jul 20; both mature before Sep 22. | Jul 20 |
| Parsley | Mar 20 | Jun 5–Jun 12 | 109 | fits: 70 days to maturity, 109 available after Jun 5. | Jun 30 |
| Celery | Mar 20 | Jun 5–Jun 19 | 109 | head-start: Even planted out Jun 5, the outdoor season is about 11 days short; choose an early variety or grow under cover. | — |
| Scallions | Mar 20 | May 1–May 15 | 158 | two-plantings: Plant May 1 and again by Jul 24; both mature before Oct 6. | Jul 24 |
| Turnip | — | May 1–May 15 | 158 | two-plantings: Plant May 1 and again by Aug 3; both mature before Oct 6. | Aug 3 |
| Kohlrabi | — | Apr 17–May 1 | 172 | two-plantings: Plant Apr 17 and again by Jul 29; both mature before Oct 6. | Jul 29 |
| Bok Choy | May 1 | May 22–May 29 | 123 | two-plantings: Plant May 22 and again by Jul 25; both mature before Sep 22. | Jul 25 |
| Collards | Mar 20 | May 1–May 15 | 158 | two-plantings: Plant May 1 and again by Jul 24; both mature before Oct 6. | Jul 24 |
| Cantaloupe | May 15 | Jun 12–Jun 19 | 67 | head-start: Even planted out Jun 12, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Chives | Mar 6 | Jun 5–Jun 12 | 123 | fits: 90 days to maturity, 123 available after Jun 5. | — |
| Dill | — | Apr 3–Jun 26 | 172 | two-plantings: Plant Apr 3 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Oregano | Mar 20 | Jun 5–Jun 12 | 123 | fits: 80 days to maturity, 123 available after Jun 5. | — |
| Rosemary | Mar 6 | Jun 5–Jun 12 | 109 | fits: 80 days to maturity, 109 available after Jun 5. | — |
| Sage | Apr 3 | Jun 5–Jun 12 | 123 | fits: 75 days to maturity, 123 available after Jun 5. | — |
| Thyme | Mar 20 | Jun 5–Jun 12 | 123 | fits: 90 days to maturity, 123 available after Jun 5. | — |
| Calendula | Apr 17 | May 15–May 29 | 130 | two-plantings: Plant May 15 and again by Jul 20; both mature before Sep 22. | Jul 20 |
| Cosmos | May 1 | May 29–Jun 12 | 95 | fits: 60 days to maturity, 95 available after May 29. | Jun 19 |
| Lavender | Mar 6 | May 29–Jun 12 | 130 | fits: 90 days to maturity, 130 available after May 29. | — |
| Marigolds | Apr 17 | May 29–Jun 5 | 95 | fits: 50 days to maturity, 95 available after May 29. | Jun 29 |
| Melons | May 15 | Jun 12–Jun 19 | 67 | head-start: Even planted out Jun 12, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Mint | — | May 29–Jun 12 | 130 | fits: 90 days to maturity, 130 available after May 29. | — |
| Nasturtiums | May 1 | May 29–Jun 5 | 95 | fits: 55 days to maturity, 95 available after May 29. | Jun 24 |
| Pole Beans | — | Jun 5–Jun 19 | 88 | fits: 65 days to maturity, 88 available after Jun 5. | Jun 14 |
| Spaghetti Squash | May 15 | Jun 12–Jun 19 | 74 | head-start: Even planted out Jun 12, the outdoor season is about 16 days short; choose an early variety or grow under cover. | — |
| Sunflowers | — | May 29–Jun 12 | 95 | fits: 70 days to maturity, 95 available after May 29. | Jun 9 |
| Tomatillos | Apr 3 | Jun 5–Jun 12 | 74 | head-start: Even planted out Jun 5, the outdoor season is about 1 days short; choose an early variety or grow under cover. | — |
| Watermelon | May 15 | Jun 5–Jun 12 | 74 | head-start: Even planted out Jun 5, the outdoor season is about 6 days short; choose an early variety or grow under cover. | — |
| Yellow Squash | May 15 | Jun 12–Jun 19 | 81 | fits: 55 days to maturity, 81 available after Jun 12. | Jun 24 |
| Zinnias | May 1 | May 29–Jun 12 | 95 | fits: 60 days to maturity, 95 available after May 29. | Jun 19 |
Month by month in Leavenworth
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Start indoors: Chives (Mar 6), Lavender (Mar 6), Onion (Mar 6), Rosemary (Mar 6), Celery (Mar 20), Collards (Mar 20), +5 more. |
| April | Start indoors: Broccoli (Apr 3), Brussel Sprouts (Apr 3), Cabbage (Apr 3), Lettuce (Apr 3), Sage (Apr 3), Swiss Chard (Apr 3), +8 more. Direct sow from: Arugula (Apr 3), Beets (Apr 3), Dill (Apr 3), Peas (Apr 3), Radish (Apr 3), Spinach (Apr 3), +1 more. Plant: Strawberry (Apr 24). |
| May | Start indoors: Bok Choy (May 1), Corn (May 1), Cosmos (May 1), Nasturtiums (May 1), Okra (May 1), Zinnias (May 1), +9 more. Direct sow from: Cilantro (May 1), Turnip (May 1), Carrots (May 8), Potatoes (May 15), Sunflowers (May 29). Transplant from: Broccoli (May 1), Brussel Sprouts (May 1), Cabbage (May 1), Collards (May 1), Kale (May 1), Lettuce (May 1), +12 more. Last frost around May 29. |
| June | Direct sow from: Beans (Jun 5), Pole Beans (Jun 5). Transplant from: Celery (Jun 5), Chives (Jun 5), Corn (Jun 5), Okra (Jun 5), Oregano (Jun 5), Parsley (Jun 5), +17 more. Last sowing dates: Sunflowers (Jun 9), Brussel Sprouts (Jun 14), Pole Beans (Jun 14), Cosmos (Jun 19), Cucumber (Jun 19), Zinnias (Jun 19), +9 more. |
| July | Last sowing dates: Peas (Jul 5), Cabbage (Jul 14), Carrots (Jul 14), Beets (Jul 15), Dill (Jul 15), Swiss Chard (Jul 15), +8 more. |
| August | Last sowing dates: Turnip (Aug 3), Arugula (Aug 13), Spinach (Aug 13), Radish (Aug 14). |
| September | Direct sow from: Garlic (Sep 15). First frost around September 15. |
| October | Last sowing dates: Garlic (Oct 6). |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| 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 Leavenworth, WA (ZIP 98826)?
The median last spring frost date for Leavenworth, WA (ZIP code 98826) is around May 29. 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 May 10; one in ten it runs past June 18.
What is the first fall frost date in Leavenworth, WA?
The median first fall frost date for Leavenworth, WA is around September 15. 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 September 1 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Leavenworth, WA?
The frost-free growing season in Leavenworth is about 109 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 Leavenworth (109 frost-free days, a short season), 29 of 56 planner crops fit outright, 15 get two plantings, 9 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Leavenworth, WA?
Leavenworth, WA is in USDA hardiness zone 7a (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 Leavenworth, WA?
Start tomatoes indoors Apr 24 and plant out Jun 12 in Leavenworth. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Leavenworth?
Two: plant May 1 and again by Jul 25; both mature before Sep 22.
When do I plant garlic in Leavenworth?
Sep 15 to Oct 6; it overwinters and is ready the following summer.
Can I grow Celery in Leavenworth?
Yes, with help. Even planted out Jun 5, the outdoor season is about 11 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Cashmere (ZIP 98815) has 140 frost-free days, 31 more than Leavenworth (ZIP 98826). See Cashmere ZIP 98815 frost dates
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