Frost Dates for Pullman, WA 99163
Last spring frost May 12 · First fall frost September 27 · 138 frost-free days · USDA Zone 6b
ZIP 99163 has about 34,000 people.
Moderate season: 138 frost-free days. Spring frost risk spans April 22–May 31 (39 days). Fall frost risk spans September 9–October 14 (35 days).
Frost probability for 99163
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 31 | May 12 | April 22 |
| Fall (first frost) | September 9 | September 27 | October 14 |
Dates come from NOAA 1971–2000 freeze probabilities at PULLMAN 2 NW (4.3 km away); the 50% date is the median year.
Which crops fit a 138-day season in Pullman
In Pullman (138 frost-free days, a moderate season), 38 of 56 planner crops fit outright, 17 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 7 | May 26–Jun 2 | 96 | fits: 80 days to maturity, 96 available after May 26. | May 28 |
| Pepper | Mar 31 | May 26–Jun 2 | 96 | fits: 75 days to maturity, 96 available after May 26. | Jun 2 |
| Lettuce | Mar 17 | Apr 14–Apr 21 | 173 | two-plantings: Plant Apr 14 and again by Aug 6; both mature before Oct 4. | Aug 6 |
| Carrots | — | Apr 21–Apr 28 | 180 | fits: 70 days to maturity, 180 available after Apr 21. | Jul 26 |
| Cucumber | Apr 21 | May 26–Jun 2 | 110 | fits: 60 days to maturity, 110 available after May 26. | Jul 1 |
| Beans | — | May 19–Jun 2 | 124 | fits: 60 days to maturity, 124 available after May 19. | Jul 8 |
| Peas | — | Mar 17–May 26 | 201 | fits: 65 days to maturity, 201 available after Mar 17. | Jul 17 |
| Zucchini | Apr 28 | May 26–Jun 2 | 110 | fits: 55 days to maturity, 110 available after May 26. | Jul 6 |
| Onion | Feb 17 | Apr 14–Apr 28 | 173 | fits: 100 days to maturity, 173 available after Apr 14. | — |
| Spinach | — | Mar 17–May 5 | 215 | two-plantings: Plant Mar 17 and again by Aug 25; both mature before Oct 18. | Aug 25 |
| Kale | Mar 3 | Apr 14–Apr 28 | 187 | two-plantings: Plant Apr 14 and again by Aug 10; both mature before Oct 18. | Aug 10 |
| Broccoli | Mar 17 | Apr 14–Apr 28 | 173 | fits: 80 days to maturity, 173 available after Apr 14. | Jul 2 |
| Cabbage | Mar 17 | Apr 14–Apr 28 | 187 | fits: 70 days to maturity, 187 available after Apr 14. | Jul 26 |
| Radish | — | Mar 17–Jun 9 | 201 | two-plantings: Plant Mar 17 and again by Aug 26; both mature before Oct 4. | Aug 26 |
| Beets | — | Mar 17–Jun 9 | 201 | two-plantings: Plant Mar 17 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Potatoes | — | Apr 28–May 5 | 159 | fits: 90 days to maturity, 159 available after Apr 28. | — |
| Garlic | — | Sep 27 | 243 | overwinter: Plant Sep 27 to Oct 18; harvest the following summer. | Oct 18 |
| Strawberry | — | Apr 7–Jun 2 | 194 | perennial: A perennial: plant Apr 7; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 14 | May 19–May 26 | 110 | fits: 75 days to maturity, 110 available after May 19. | Jun 9 |
| Pumpkin | Apr 28 | May 26–May 26 | 103 | fits: 100 days to maturity, 103 available after May 26. | — |
| Cauliflower | Mar 31 | May 5–May 19 | 152 | fits: 75 days to maturity, 152 available after May 5. | Jul 7 |
| Swiss Chard | Mar 17 | Apr 28–Apr 28 | 159 | two-plantings: Plant Apr 28 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Arugula | — | Mar 17–Jun 9 | 215 | two-plantings: Plant Mar 17 and again by Aug 25; both mature before Oct 18. | Aug 25 |
| Brussel Sprouts | Mar 17 | Apr 14–Apr 28 | 187 | fits: 100 days to maturity, 187 available after Apr 14. | Jun 26 |
| Butternut Squash | Apr 28 | May 26–Jun 2 | 103 | fits: 100 days to maturity, 103 available after May 26. | — |
| Eggplant | Mar 24 | May 26–Jun 2 | 96 | fits: 70 days to maturity, 96 available after May 26. | Jun 7 |
| Okra | Apr 14 | May 19–May 26 | 117 | fits: 55 days to maturity, 117 available after May 19. | Jul 6 |
| Basil | Apr 7 | Jun 2–Jun 2 | 103 | fits: 60 days to maturity, 103 available after Jun 2. | Jul 1 |
| Cilantro | — | Apr 14–May 5 | 173 | two-plantings: Plant Apr 14 and again by Aug 1; both mature before Oct 4. | Aug 1 |
| Parsley | Mar 3 | May 19–May 26 | 138 | fits: 70 days to maturity, 138 available after May 19. | Jul 12 |
| Celery | Mar 3 | May 19–Jun 2 | 138 | fits: 120 days to maturity, 138 available after May 19. | May 23 |
| Scallions | Mar 3 | Apr 14–Apr 28 | 187 | two-plantings: Plant Apr 14 and again by Aug 5; both mature before Oct 18. | Aug 5 |
| Turnip | — | Apr 14–Apr 28 | 187 | two-plantings: Plant Apr 14 and again by Aug 15; both mature before Oct 18. | Aug 15 |
| Kohlrabi | — | Mar 31–Apr 14 | 201 | two-plantings: Plant Mar 31 and again by Aug 10; both mature before Oct 18. | Aug 10 |
| Bok Choy | Apr 14 | May 5–May 12 | 152 | two-plantings: Plant May 5 and again by Aug 6; both mature before Oct 4. | Aug 6 |
| Collards | Mar 3 | Apr 14–Apr 28 | 187 | two-plantings: Plant Apr 14 and again by Aug 5; both mature before Oct 18. | Aug 5 |
| Cantaloupe | Apr 28 | May 26–Jun 2 | 96 | fits: 85 days to maturity, 96 available after May 26. | — |
| Chives | Feb 17 | May 19–May 26 | 152 | fits: 90 days to maturity, 152 available after May 19. | — |
| Dill | — | Mar 17–Jun 9 | 201 | two-plantings: Plant Mar 17 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Oregano | Mar 3 | May 19–May 26 | 152 | fits: 80 days to maturity, 152 available after May 19. | — |
| Rosemary | Feb 17 | May 19–May 26 | 138 | fits: 80 days to maturity, 138 available after May 19. | — |
| Sage | Mar 17 | May 19–May 26 | 152 | fits: 75 days to maturity, 152 available after May 19. | — |
| Thyme | Mar 3 | May 19–May 26 | 152 | fits: 90 days to maturity, 152 available after May 19. | — |
| Calendula | Mar 31 | Apr 28–May 12 | 159 | two-plantings: Plant Apr 28 and again by Aug 1; both mature before Oct 4. | Aug 1 |
| Cosmos | Apr 14 | May 12–May 26 | 124 | fits: 60 days to maturity, 124 available after May 12. | Jul 1 |
| Lavender | Feb 17 | May 12–May 26 | 159 | fits: 90 days to maturity, 159 available after May 12. | — |
| Marigolds | Mar 31 | May 12–May 19 | 124 | two-plantings: Plant May 12 and again by Jul 11; both mature before Sep 13. | Jul 11 |
| Melons | Apr 28 | May 26–Jun 2 | 96 | fits: 85 days to maturity, 96 available after May 26. | — |
| Mint | — | May 12–May 26 | 159 | fits: 90 days to maturity, 159 available after May 12. | — |
| Nasturtiums | Apr 14 | May 12–May 19 | 124 | two-plantings: Plant May 12 and again by Jul 6; both mature before Sep 13. | Jul 6 |
| Pole Beans | — | May 19–Jun 2 | 117 | fits: 65 days to maturity, 117 available after May 19. | Jun 26 |
| Spaghetti Squash | Apr 28 | May 26–Jun 2 | 103 | fits: 90 days to maturity, 103 available after May 26. | — |
| Sunflowers | — | May 12–May 26 | 124 | fits: 70 days to maturity, 124 available after May 12. | Jun 21 |
| Tomatillos | Mar 17 | May 19–May 26 | 103 | fits: 75 days to maturity, 103 available after May 19. | Jun 2 |
| Watermelon | Apr 28 | May 19–May 26 | 103 | fits: 80 days to maturity, 103 available after May 19. | May 28 |
| Yellow Squash | Apr 28 | May 26–Jun 2 | 110 | fits: 55 days to maturity, 110 available after May 26. | Jul 6 |
| Zinnias | Apr 14 | May 12–May 26 | 124 | fits: 60 days to maturity, 124 available after May 12. | Jul 1 |
Month by month in Pullman
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 17), Lavender (Feb 17), Onion (Feb 17), Rosemary (Feb 17). |
| March | Start indoors: Celery (Mar 3), Collards (Mar 3), Kale (Mar 3), Oregano (Mar 3), Parsley (Mar 3), Scallions (Mar 3), +13 more. Direct sow from: Arugula (Mar 17), Beets (Mar 17), Dill (Mar 17), Peas (Mar 17), Radish (Mar 17), Spinach (Mar 17), +1 more. |
| April | Start indoors: Basil (Apr 7), Tomato (Apr 7), Bok Choy (Apr 14), Corn (Apr 14), Cosmos (Apr 14), Nasturtiums (Apr 14), +11 more. Direct sow from: Cilantro (Apr 14), Turnip (Apr 14), Carrots (Apr 21), Potatoes (Apr 28). Transplant from: Broccoli (Apr 14), Brussel Sprouts (Apr 14), Cabbage (Apr 14), Collards (Apr 14), Kale (Apr 14), Lettuce (Apr 14), +4 more. Plant: Strawberry (Apr 7). |
| May | Direct sow from: Sunflowers (May 12), Beans (May 19), Pole Beans (May 19). Transplant from: Bok Choy (May 5), Cauliflower (May 5), Cosmos (May 12), Lavender (May 12), Marigolds (May 12), Mint (May 12), +24 more. Last frost around May 12. Last sowing dates: Celery (May 23), Tomato (May 28), Watermelon (May 28). |
| June | Transplant from: Basil (Jun 2). Last sowing dates: Pepper (Jun 2), Tomatillos (Jun 2), Eggplant (Jun 7), Corn (Jun 9), Sunflowers (Jun 21), Brussel Sprouts (Jun 26), +1 more. |
| July | Last sowing dates: Basil (Jul 1), Cosmos (Jul 1), Cucumber (Jul 1), Zinnias (Jul 1), Broccoli (Jul 2), Nasturtiums (Jul 6), +13 more. |
| August | Last sowing dates: Calendula (Aug 1), Cilantro (Aug 1), Collards (Aug 5), Scallions (Aug 5), Bok Choy (Aug 6), Lettuce (Aug 6), +6 more. |
| September | Direct sow from: Garlic (Sep 27). First frost around September 27. |
| October | Last sowing dates: Garlic (Oct 18). |
| 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 Pullman, WA (ZIP 99163)?
The median last spring frost date for Pullman, WA (ZIP code 99163) is around May 12. 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 April 22; one in ten it runs past May 31.
What is the first fall frost date in Pullman, WA?
The median first fall frost date for Pullman, WA is around September 27. 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 9 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Pullman, WA?
The frost-free growing season in Pullman is about 138 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 Pullman (138 frost-free days, a moderate season), 38 of 56 planner crops fit outright, 17 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Pullman, WA?
Pullman, WA is in USDA hardiness zone 6b (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 Pullman, WA?
Start tomatoes indoors Apr 7 and plant out May 26 in Pullman. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Pullman?
Two: plant Apr 14 and again by Aug 6; both mature before Oct 4.
When do I plant garlic in Pullman?
Sep 27 to Oct 18; it overwinters and is ready the following summer.
Which nearby ZIP has a longer season?
Clarkston (ZIP 99403) has 150 frost-free days, 12 more than Pullman (ZIP 99163). See Clarkston ZIP 99403 frost dates
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