Frost Dates for Pasco, WA 99301
Last spring frost April 8 · First fall frost October 16 · 191 frost-free days · USDA Zone 7a
ZIP 99301 has about 87,000 people.
Long season: 191 frost-free days. Spring frost risk spans March 21–April 29 (39 days). Fall frost risk spans September 29–November 2 (34 days).
Frost probability for 99301
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 29 | April 8 | March 21 |
| Fall (first frost) | September 29 | October 16 | November 2 |
Dates come from NOAA 1971–2000 freeze probabilities at KENNEWICK (23.8 km away); the 50% date is the median year.
Which crops fit a 191-day season in Pasco
In Pasco (191 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 4 | Apr 22–Apr 29 | 149 | fits: 80 days to maturity, 149 available after Apr 22. | Jun 16 |
| Pepper | Feb 25 | Apr 22–Apr 29 | 149 | fits: 75 days to maturity, 149 available after Apr 22. | Jun 21 |
| Lettuce | Feb 11 | Mar 11–Mar 18 | 226 | two-plantings: Plant Mar 11 and again by Aug 25; both mature before Oct 23. | Aug 25 |
| Carrots | — | Mar 18–Mar 25 | 233 | fits: 70 days to maturity, 233 available after Mar 18. | Aug 14 |
| Cucumber | Mar 18 | Apr 22–Apr 29 | 163 | two-plantings: Plant Apr 22 and again by Jul 20; both mature before Oct 2. | Jul 20 |
| Beans | — | Apr 15–Apr 29 | 177 | two-plantings: Plant Apr 15 and again by Jul 27; both mature before Oct 9. | Jul 27 |
| Peas | — | Feb 11–Apr 22 | 254 | fits: 65 days to maturity, 254 available after Feb 11. | Aug 5 |
| Zucchini | Mar 25 | Apr 22–Apr 29 | 163 | two-plantings: Plant Apr 22 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Onion | Jan 14 | Mar 11–Mar 25 | 226 | fits: 100 days to maturity, 226 available after Mar 11. | — |
| Spinach | — | Feb 11–Apr 1 | 268 | two-plantings: Plant Feb 11 and again by Sep 13; both mature before Nov 6. | Sep 13 |
| Kale | Jan 28 | Mar 11–Mar 25 | 240 | two-plantings: Plant Mar 11 and again by Aug 29; both mature before Nov 6. | Aug 29 |
| Broccoli | Feb 11 | Mar 11–Mar 25 | 226 | fits: 80 days to maturity, 226 available after Mar 11. | Jul 21 |
| Cabbage | Feb 11 | Mar 11–Mar 25 | 240 | fits: 70 days to maturity, 240 available after Mar 11. | Aug 14 |
| Radish | — | Feb 11–May 6 | 254 | two-plantings: Plant Feb 11 and again by Sep 14; both mature before Oct 23. | Sep 14 |
| Beets | — | Feb 11–May 6 | 254 | two-plantings: Plant Feb 11 and again by Aug 15; both mature before Oct 23. | Aug 15 |
| Potatoes | — | Mar 25–Apr 1 | 212 | fits: 90 days to maturity, 212 available after Mar 25. | — |
| Garlic | — | Oct 16 | 296 | overwinter: Plant Oct 16 to Nov 6; harvest the following summer. | Nov 6 |
| Strawberry | — | Mar 4–Apr 29 | 247 | perennial: A perennial: plant Mar 4; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 11 | Apr 15–Apr 22 | 163 | fits: 75 days to maturity, 163 available after Apr 15. | Jun 28 |
| Pumpkin | Mar 25 | Apr 22–Apr 22 | 156 | fits: 100 days to maturity, 156 available after Apr 22. | Jun 3 |
| Cauliflower | Feb 25 | Apr 1–Apr 15 | 205 | fits: 75 days to maturity, 205 available after Apr 1. | Jul 26 |
| Swiss Chard | Feb 11 | Mar 25–Mar 25 | 212 | two-plantings: Plant Mar 25 and again by Aug 15; both mature before Oct 23. | Aug 15 |
| Arugula | — | Feb 11–May 6 | 268 | two-plantings: Plant Feb 11 and again by Sep 13; both mature before Nov 6. | Sep 13 |
| Brussel Sprouts | Feb 11 | Mar 11–Mar 25 | 240 | fits: 100 days to maturity, 240 available after Mar 11. | Jul 15 |
| Butternut Squash | Mar 25 | Apr 22–Apr 29 | 156 | fits: 100 days to maturity, 156 available after Apr 22. | Jun 3 |
| Eggplant | Feb 18 | Apr 22–Apr 29 | 149 | fits: 70 days to maturity, 149 available after Apr 22. | Jun 26 |
| Okra | Mar 11 | Apr 15–Apr 22 | 170 | two-plantings: Plant Apr 15 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Basil | Mar 4 | Apr 29–Apr 29 | 156 | two-plantings: Plant Apr 29 and again by Jul 20; both mature before Oct 2. | Jul 20 |
| Cilantro | — | Mar 11–Apr 1 | 226 | two-plantings: Plant Mar 11 and again by Aug 20; both mature before Oct 23. | Aug 20 |
| Parsley | Jan 28 | Apr 15–Apr 22 | 191 | fits: 70 days to maturity, 191 available after Apr 15. | Jul 31 |
| Celery | Jan 28 | Apr 15–Apr 29 | 191 | fits: 120 days to maturity, 191 available after Apr 15. | Jun 11 |
| Scallions | Jan 28 | Mar 11–Mar 25 | 240 | two-plantings: Plant Mar 11 and again by Aug 24; both mature before Nov 6. | Aug 24 |
| Turnip | — | Mar 11–Mar 25 | 240 | two-plantings: Plant Mar 11 and again by Sep 3; both mature before Nov 6. | Sep 3 |
| Kohlrabi | — | Feb 25–Mar 11 | 254 | two-plantings: Plant Feb 25 and again by Aug 29; both mature before Nov 6. | Aug 29 |
| Bok Choy | Mar 11 | Apr 1–Apr 8 | 205 | two-plantings: Plant Apr 1 and again by Aug 25; both mature before Oct 23. | Aug 25 |
| Collards | Jan 28 | Mar 11–Mar 25 | 240 | two-plantings: Plant Mar 11 and again by Aug 24; both mature before Nov 6. | Aug 24 |
| Cantaloupe | Mar 25 | Apr 22–Apr 29 | 149 | fits: 85 days to maturity, 149 available after Apr 22. | Jun 11 |
| Chives | Jan 14 | Apr 15–Apr 22 | 205 | fits: 90 days to maturity, 205 available after Apr 15. | — |
| Dill | — | Feb 11–May 6 | 254 | two-plantings: Plant Feb 11 and again by Aug 15; both mature before Oct 23. | Aug 15 |
| Oregano | Jan 28 | Apr 15–Apr 22 | 205 | fits: 80 days to maturity, 205 available after Apr 15. | — |
| Rosemary | Jan 14 | Apr 15–Apr 22 | 191 | fits: 80 days to maturity, 191 available after Apr 15. | — |
| Sage | Feb 11 | Apr 15–Apr 22 | 205 | fits: 75 days to maturity, 205 available after Apr 15. | — |
| Thyme | Jan 28 | Apr 15–Apr 22 | 205 | fits: 90 days to maturity, 205 available after Apr 15. | — |
| Calendula | Feb 25 | Mar 25–Apr 8 | 212 | two-plantings: Plant Mar 25 and again by Aug 20; both mature before Oct 23. | Aug 20 |
| Cosmos | Mar 11 | Apr 8–Apr 22 | 177 | two-plantings: Plant Apr 8 and again by Jul 20; both mature before Oct 2. | Jul 20 |
| Lavender | Jan 14 | Apr 8–Apr 22 | 212 | fits: 90 days to maturity, 212 available after Apr 8. | — |
| Marigolds | Feb 25 | Apr 8–Apr 15 | 177 | two-plantings: Plant Apr 8 and again by Jul 30; both mature before Oct 2. | Jul 30 |
| Melons | Mar 25 | Apr 22–Apr 29 | 149 | fits: 85 days to maturity, 149 available after Apr 22. | Jun 11 |
| Mint | — | Apr 8–Apr 22 | 212 | fits: 90 days to maturity, 212 available after Apr 8. | — |
| Nasturtiums | Mar 11 | Apr 8–Apr 15 | 177 | two-plantings: Plant Apr 8 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Pole Beans | — | Apr 15–Apr 29 | 170 | fits: 65 days to maturity, 170 available after Apr 15. | Jul 15 |
| Spaghetti Squash | Mar 25 | Apr 22–Apr 29 | 156 | fits: 90 days to maturity, 156 available after Apr 22. | Jun 13 |
| Sunflowers | — | Apr 8–Apr 22 | 177 | fits: 70 days to maturity, 177 available after Apr 8. | Jul 10 |
| Tomatillos | Feb 11 | Apr 15–Apr 22 | 156 | fits: 75 days to maturity, 156 available after Apr 15. | Jun 21 |
| Watermelon | Mar 25 | Apr 15–Apr 22 | 156 | fits: 80 days to maturity, 156 available after Apr 15. | Jun 16 |
| Yellow Squash | Mar 25 | Apr 22–Apr 29 | 163 | two-plantings: Plant Apr 22 and again by Jul 25; both mature before Oct 2. | Jul 25 |
| Zinnias | Mar 11 | Apr 8–Apr 22 | 177 | two-plantings: Plant Apr 8 and again by Jul 20; both mature before Oct 2. | Jul 20 |
Month by month in Pasco
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 14), Lavender (Jan 14), Onion (Jan 14), Rosemary (Jan 14), Celery (Jan 28), Collards (Jan 28), +5 more. |
| February | Start indoors: Broccoli (Feb 11), Brussel Sprouts (Feb 11), Cabbage (Feb 11), Lettuce (Feb 11), Sage (Feb 11), Swiss Chard (Feb 11), +6 more. Direct sow from: Arugula (Feb 11), Beets (Feb 11), Dill (Feb 11), Peas (Feb 11), Radish (Feb 11), Spinach (Feb 11), +1 more. |
| March | Start indoors: Basil (Mar 4), Tomato (Mar 4), Bok Choy (Mar 11), Corn (Mar 11), Cosmos (Mar 11), Nasturtiums (Mar 11), +11 more. Direct sow from: Cilantro (Mar 11), Turnip (Mar 11), Carrots (Mar 18), Potatoes (Mar 25). Transplant from: Broccoli (Mar 11), Brussel Sprouts (Mar 11), Cabbage (Mar 11), Collards (Mar 11), Kale (Mar 11), Lettuce (Mar 11), +4 more. Plant: Strawberry (Mar 4). |
| April | Direct sow from: Sunflowers (Apr 8), Beans (Apr 15), Pole Beans (Apr 15). Transplant from: Bok Choy (Apr 1), Cauliflower (Apr 1), Cosmos (Apr 8), Lavender (Apr 8), Marigolds (Apr 8), Mint (Apr 8), +25 more. Last frost around April 8. |
| May | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| June | Last sowing dates: Butternut Squash (Jun 3), Pumpkin (Jun 3), Cantaloupe (Jun 11), Celery (Jun 11), Melons (Jun 11), Spaghetti Squash (Jun 13), +6 more. |
| July | Last sowing dates: Sunflowers (Jul 10), Brussel Sprouts (Jul 15), Pole Beans (Jul 15), Basil (Jul 20), Cosmos (Jul 20), Cucumber (Jul 20), +10 more. |
| August | Last sowing dates: Peas (Aug 5), Cabbage (Aug 14), Carrots (Aug 14), Beets (Aug 15), Dill (Aug 15), Swiss Chard (Aug 15), +8 more. |
| September | Last sowing dates: Turnip (Sep 3), Arugula (Sep 13), Spinach (Sep 13), Radish (Sep 14). |
| October | Direct sow from: Garlic (Oct 16). First frost around October 16. |
| November | Last sowing dates: Garlic (Nov 6). |
| 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 Pasco, WA (ZIP 99301)?
The median last spring frost date for Pasco, WA (ZIP code 99301) is around April 8. 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 21; one in ten it runs past April 29.
What is the first fall frost date in Pasco, WA?
The median first fall frost date for Pasco, WA is around October 16. 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 29 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Pasco, WA?
The frost-free growing season in Pasco is about 191 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 Pasco (191 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 Pasco, WA?
Pasco, 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 Pasco, WA?
Start tomatoes indoors Mar 4 and plant out Apr 22 in Pasco. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Pasco?
Two: plant Mar 11 and again by Aug 25; both mature before Oct 23.
When do I plant garlic in Pasco?
Oct 16 to Nov 6; it overwinters and is ready the following summer.
Can I get two tomato crops in Pasco?
Yes: plant out Apr 22 for a summer crop, and set out a second round of transplants by Jun 16 for a fall crop.
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