Frost Dates for College Place, WA 99324
Last spring frost May 10 · First fall frost September 25 · 138 frost-free days · USDA Zone 7a
ZIP 99324 has about 10,100 people.
Moderate season: 138 frost-free days. Spring frost risk spans April 24–May 26 (32 days). Fall frost risk spans September 12–October 8 (26 days).
Frost probability for 99324
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 26 | May 10 | April 24 |
| Fall (first frost) | September 12 | September 25 | October 8 |
Dates come from NOAA 1971–2000 freeze probabilities at WHITMAN MISSION (6.0 km away); the 50% date is the median year.
Which crops fit a 138-day season in College Place
In College Place (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 5 | May 24–May 31 | 96 | fits: 80 days to maturity, 96 available after May 24. | May 26 |
| Pepper | Mar 29 | May 24–May 31 | 96 | fits: 75 days to maturity, 96 available after May 24. | May 31 |
| Lettuce | Mar 15 | Apr 12–Apr 19 | 173 | two-plantings: Plant Apr 12 and again by Aug 4; both mature before Oct 2. | Aug 4 |
| Carrots | — | Apr 19–Apr 26 | 180 | fits: 70 days to maturity, 180 available after Apr 19. | Jul 24 |
| Cucumber | Apr 19 | May 24–May 31 | 110 | fits: 60 days to maturity, 110 available after May 24. | Jun 29 |
| Beans | — | May 17–May 31 | 124 | fits: 60 days to maturity, 124 available after May 17. | Jul 6 |
| Peas | — | Mar 15–May 24 | 201 | fits: 65 days to maturity, 201 available after Mar 15. | Jul 15 |
| Zucchini | Apr 26 | May 24–May 31 | 110 | fits: 55 days to maturity, 110 available after May 24. | Jul 4 |
| Onion | Feb 15 | Apr 12–Apr 26 | 173 | fits: 100 days to maturity, 173 available after Apr 12. | — |
| Spinach | — | Mar 15–May 3 | 215 | two-plantings: Plant Mar 15 and again by Aug 23; both mature before Oct 16. | Aug 23 |
| Kale | Mar 1 | Apr 12–Apr 26 | 187 | two-plantings: Plant Apr 12 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Broccoli | Mar 15 | Apr 12–Apr 26 | 173 | fits: 80 days to maturity, 173 available after Apr 12. | Jun 30 |
| Cabbage | Mar 15 | Apr 12–Apr 26 | 187 | fits: 70 days to maturity, 187 available after Apr 12. | Jul 24 |
| Radish | — | Mar 15–Jun 7 | 201 | two-plantings: Plant Mar 15 and again by Aug 24; both mature before Oct 2. | Aug 24 |
| Beets | — | Mar 15–Jun 7 | 201 | two-plantings: Plant Mar 15 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Potatoes | — | Apr 26–May 3 | 159 | fits: 90 days to maturity, 159 available after Apr 26. | — |
| Garlic | — | Sep 25 | 243 | overwinter: Plant Sep 25 to Oct 16; harvest the following summer. | Oct 16 |
| Strawberry | — | Apr 5–May 31 | 194 | perennial: A perennial: plant Apr 5; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 12 | May 17–May 24 | 110 | fits: 75 days to maturity, 110 available after May 17. | Jun 7 |
| Pumpkin | Apr 26 | May 24–May 24 | 103 | fits: 100 days to maturity, 103 available after May 24. | — |
| Cauliflower | Mar 29 | May 3–May 17 | 152 | fits: 75 days to maturity, 152 available after May 3. | Jul 5 |
| Swiss Chard | Mar 15 | Apr 26–Apr 26 | 159 | two-plantings: Plant Apr 26 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Arugula | — | Mar 15–Jun 7 | 215 | two-plantings: Plant Mar 15 and again by Aug 23; both mature before Oct 16. | Aug 23 |
| Brussel Sprouts | Mar 15 | Apr 12–Apr 26 | 187 | fits: 100 days to maturity, 187 available after Apr 12. | Jun 24 |
| Butternut Squash | Apr 26 | May 24–May 31 | 103 | fits: 100 days to maturity, 103 available after May 24. | — |
| Eggplant | Mar 22 | May 24–May 31 | 96 | fits: 70 days to maturity, 96 available after May 24. | Jun 5 |
| Okra | Apr 12 | May 17–May 24 | 117 | fits: 55 days to maturity, 117 available after May 17. | Jul 4 |
| Basil | Apr 5 | May 31–May 31 | 103 | fits: 60 days to maturity, 103 available after May 31. | Jun 29 |
| Cilantro | — | Apr 12–May 3 | 173 | two-plantings: Plant Apr 12 and again by Jul 30; both mature before Oct 2. | Jul 30 |
| Parsley | Mar 1 | May 17–May 24 | 138 | fits: 70 days to maturity, 138 available after May 17. | Jul 10 |
| Celery | Mar 1 | May 17–May 31 | 138 | fits: 120 days to maturity, 138 available after May 17. | May 21 |
| Scallions | Mar 1 | Apr 12–Apr 26 | 187 | two-plantings: Plant Apr 12 and again by Aug 3; both mature before Oct 16. | Aug 3 |
| Turnip | — | Apr 12–Apr 26 | 187 | two-plantings: Plant Apr 12 and again by Aug 13; both mature before Oct 16. | Aug 13 |
| Kohlrabi | — | Mar 29–Apr 12 | 201 | two-plantings: Plant Mar 29 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Bok Choy | Apr 12 | May 3–May 10 | 152 | two-plantings: Plant May 3 and again by Aug 4; both mature before Oct 2. | Aug 4 |
| Collards | Mar 1 | Apr 12–Apr 26 | 187 | two-plantings: Plant Apr 12 and again by Aug 3; both mature before Oct 16. | Aug 3 |
| Cantaloupe | Apr 26 | May 24–May 31 | 96 | fits: 85 days to maturity, 96 available after May 24. | — |
| Chives | Feb 15 | May 17–May 24 | 152 | fits: 90 days to maturity, 152 available after May 17. | — |
| Dill | — | Mar 15–Jun 7 | 201 | two-plantings: Plant Mar 15 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Oregano | Mar 1 | May 17–May 24 | 152 | fits: 80 days to maturity, 152 available after May 17. | — |
| Rosemary | Feb 15 | May 17–May 24 | 138 | fits: 80 days to maturity, 138 available after May 17. | — |
| Sage | Mar 15 | May 17–May 24 | 152 | fits: 75 days to maturity, 152 available after May 17. | — |
| Thyme | Mar 1 | May 17–May 24 | 152 | fits: 90 days to maturity, 152 available after May 17. | — |
| Calendula | Mar 29 | Apr 26–May 10 | 159 | two-plantings: Plant Apr 26 and again by Jul 30; both mature before Oct 2. | Jul 30 |
| Cosmos | Apr 12 | May 10–May 24 | 124 | fits: 60 days to maturity, 124 available after May 10. | Jun 29 |
| Lavender | Feb 15 | May 10–May 24 | 159 | fits: 90 days to maturity, 159 available after May 10. | — |
| Marigolds | Mar 29 | May 10–May 17 | 124 | two-plantings: Plant May 10 and again by Jul 9; both mature before Sep 11. | Jul 9 |
| Melons | Apr 26 | May 24–May 31 | 96 | fits: 85 days to maturity, 96 available after May 24. | — |
| Mint | — | May 10–May 24 | 159 | fits: 90 days to maturity, 159 available after May 10. | — |
| Nasturtiums | Apr 12 | May 10–May 17 | 124 | two-plantings: Plant May 10 and again by Jul 4; both mature before Sep 11. | Jul 4 |
| Pole Beans | — | May 17–May 31 | 117 | fits: 65 days to maturity, 117 available after May 17. | Jun 24 |
| Spaghetti Squash | Apr 26 | May 24–May 31 | 103 | fits: 90 days to maturity, 103 available after May 24. | — |
| Sunflowers | — | May 10–May 24 | 124 | fits: 70 days to maturity, 124 available after May 10. | Jun 19 |
| Tomatillos | Mar 15 | May 17–May 24 | 103 | fits: 75 days to maturity, 103 available after May 17. | May 31 |
| Watermelon | Apr 26 | May 17–May 24 | 103 | fits: 80 days to maturity, 103 available after May 17. | May 26 |
| Yellow Squash | Apr 26 | May 24–May 31 | 110 | fits: 55 days to maturity, 110 available after May 24. | Jul 4 |
| Zinnias | Apr 12 | May 10–May 24 | 124 | fits: 60 days to maturity, 124 available after May 10. | Jun 29 |
Month by month in College Place
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 15), Lavender (Feb 15), Onion (Feb 15), Rosemary (Feb 15). |
| March | Start indoors: Celery (Mar 1), Collards (Mar 1), Kale (Mar 1), Oregano (Mar 1), Parsley (Mar 1), Scallions (Mar 1), +13 more. Direct sow from: Arugula (Mar 15), Beets (Mar 15), Dill (Mar 15), Peas (Mar 15), Radish (Mar 15), Spinach (Mar 15), +1 more. |
| April | Start indoors: Basil (Apr 5), Tomato (Apr 5), Bok Choy (Apr 12), Corn (Apr 12), Cosmos (Apr 12), Nasturtiums (Apr 12), +11 more. Direct sow from: Cilantro (Apr 12), Turnip (Apr 12), Carrots (Apr 19), Potatoes (Apr 26). Transplant from: Broccoli (Apr 12), Brussel Sprouts (Apr 12), Cabbage (Apr 12), Collards (Apr 12), Kale (Apr 12), Lettuce (Apr 12), +4 more. Plant: Strawberry (Apr 5). |
| May | Direct sow from: Sunflowers (May 10), Beans (May 17), Pole Beans (May 17). Transplant from: Bok Choy (May 3), Cauliflower (May 3), Cosmos (May 10), Lavender (May 10), Marigolds (May 10), Mint (May 10), +25 more. Last frost around May 10. Last sowing dates: Celery (May 21), Tomato (May 26), Watermelon (May 26), Pepper (May 31), Tomatillos (May 31). |
| June | Last sowing dates: Eggplant (Jun 5), Corn (Jun 7), Sunflowers (Jun 19), Brussel Sprouts (Jun 24), Pole Beans (Jun 24), Basil (Jun 29), +4 more. |
| July | Last sowing dates: Nasturtiums (Jul 4), Okra (Jul 4), Yellow Squash (Jul 4), Zucchini (Jul 4), Cauliflower (Jul 5), Beans (Jul 6), +10 more. |
| August | Last sowing dates: Collards (Aug 3), Scallions (Aug 3), Bok Choy (Aug 4), Lettuce (Aug 4), Kale (Aug 8), Kohlrabi (Aug 8), +4 more. |
| September | Direct sow from: Garlic (Sep 25). First frost around September 25. |
| October | Last sowing dates: Garlic (Oct 16). |
| 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 College Place, WA (ZIP 99324)?
The median last spring frost date for College Place, WA (ZIP code 99324) is around May 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 April 24; one in ten it runs past May 26.
What is the first fall frost date in College Place, WA?
The median first fall frost date for College Place, WA is around September 25. 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 12 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in College Place, WA?
The frost-free growing season in College Place 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 College Place (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 College Place, WA?
College Place, 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 College Place, WA?
Start tomatoes indoors Apr 5 and plant out May 24 in College Place. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in College Place?
Two: plant Apr 12 and again by Aug 4; both mature before Oct 2.
When do I plant garlic in College Place?
Sep 25 to Oct 16; it overwinters and is ready the following summer.
Which nearby ZIP has a longer season?
Walla Walla (ZIP 99362) has 166 frost-free days, 28 more than College Place (ZIP 99324). See Walla Walla ZIP 99362 frost dates
Nearby and related
- Frost dates for Walla Walla, WA 99362 (4.6 mi)
- Frost dates for Milton Freewater, OR 97862 (8.7 mi)
- Frost dates for Pendleton, OR 97801 (33.4 mi)
- Frost dates for Pasco, WA 99301 (35.6 mi)
- Frost dates for Kennewick, WA 99336 (39.8 mi)
- When to plant in WA
- When to plant Peppers in WA
- When to plant Cucumbers in WA
- When to plant Zucchini in WA
- When to plant Butternut Squash in WA
- When to plant Basil in WA
- When to plant Sweet Corn in WA
- Look up another ZIP