Frost Dates for Filer, ID 83328
Last spring frost May 18 · First fall frost September 23 · 128 frost-free days · USDA Zone 7a
ZIP 83328 has about 6,320 people.
Moderate season: 128 frost-free days. Spring frost risk spans April 29–June 7 (39 days). Fall frost risk spans September 9–October 8 (29 days).
Frost probability for 83328
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 7 | May 18 | April 29 |
| Fall (first frost) | September 9 | September 23 | October 8 |
Dates come from NOAA 1971–2000 freeze probabilities at CASTLEFORD 2 N (20.5 km away); the 50% date is the median year.
Which crops fit a 128-day season in Filer
In Filer (128 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 16 get two plantings, 2 need an indoor start, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 13 | Jun 1–Jun 8 | 86 | fits: 80 days to maturity, 86 available after Jun 1. | — |
| Pepper | Apr 6 | Jun 1–Jun 8 | 86 | fits: 75 days to maturity, 86 available after Jun 1. | — |
| Lettuce | Mar 23 | Apr 20–Apr 27 | 163 | two-plantings: Plant Apr 20 and again by Aug 2; both mature before Sep 30. | Aug 2 |
| Carrots | — | Apr 27–May 4 | 170 | fits: 70 days to maturity, 170 available after Apr 27. | Jul 22 |
| Cucumber | Apr 27 | Jun 1–Jun 8 | 100 | fits: 60 days to maturity, 100 available after Jun 1. | Jun 27 |
| Beans | — | May 25–Jun 8 | 114 | fits: 60 days to maturity, 114 available after May 25. | Jul 4 |
| Peas | — | Mar 23–Jun 1 | 191 | fits: 65 days to maturity, 191 available after Mar 23. | Jul 13 |
| Zucchini | May 4 | Jun 1–Jun 8 | 100 | fits: 55 days to maturity, 100 available after Jun 1. | Jul 2 |
| Onion | Feb 23 | Apr 20–May 4 | 163 | fits: 100 days to maturity, 163 available after Apr 20. | — |
| Spinach | — | Mar 23–May 11 | 205 | two-plantings: Plant Mar 23 and again by Aug 21; both mature before Oct 14. | Aug 21 |
| Kale | Mar 9 | Apr 20–May 4 | 177 | two-plantings: Plant Apr 20 and again by Aug 6; both mature before Oct 14. | Aug 6 |
| Broccoli | Mar 23 | Apr 20–May 4 | 163 | fits: 80 days to maturity, 163 available after Apr 20. | Jun 28 |
| Cabbage | Mar 23 | Apr 20–May 4 | 177 | fits: 70 days to maturity, 177 available after Apr 20. | Jul 22 |
| Radish | — | Mar 23–Jun 15 | 191 | two-plantings: Plant Mar 23 and again by Aug 22; both mature before Sep 30. | Aug 22 |
| Beets | — | Mar 23–Jun 15 | 191 | two-plantings: Plant Mar 23 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Potatoes | — | May 4–May 11 | 149 | fits: 90 days to maturity, 149 available after May 4. | — |
| Garlic | — | Sep 23 | 233 | overwinter: Plant Sep 23 to Oct 14; harvest the following summer. | Oct 14 |
| Strawberry | — | Apr 13–Jun 8 | 184 | perennial: A perennial: plant Apr 13; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 20 | May 25–Jun 1 | 100 | fits: 75 days to maturity, 100 available after May 25. | Jun 5 |
| Pumpkin | May 4 | Jun 1–Jun 1 | 93 | head-start: Even planted out Jun 1, the outdoor season is about 7 days short; choose an early variety or grow under cover. | — |
| Cauliflower | Apr 6 | May 11–May 25 | 142 | fits: 75 days to maturity, 142 available after May 11. | Jul 3 |
| Swiss Chard | Mar 23 | May 4–May 4 | 149 | two-plantings: Plant May 4 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Arugula | — | Mar 23–Jun 15 | 205 | two-plantings: Plant Mar 23 and again by Aug 21; both mature before Oct 14. | Aug 21 |
| Brussel Sprouts | Mar 23 | Apr 20–May 4 | 177 | fits: 100 days to maturity, 177 available after Apr 20. | Jun 22 |
| Butternut Squash | May 4 | Jun 1–Jun 8 | 93 | head-start: Even planted out Jun 1, the outdoor season is about 7 days short; choose an early variety or grow under cover. | — |
| Eggplant | Mar 30 | Jun 1–Jun 8 | 86 | fits: 70 days to maturity, 86 available after Jun 1. | Jun 3 |
| Okra | Apr 20 | May 25–Jun 1 | 107 | fits: 55 days to maturity, 107 available after May 25. | Jul 2 |
| Basil | Apr 13 | Jun 8–Jun 8 | 93 | fits: 60 days to maturity, 93 available after Jun 8. | Jun 27 |
| Cilantro | — | Apr 20–May 11 | 163 | two-plantings: Plant Apr 20 and again by Jul 28; both mature before Sep 30. | Jul 28 |
| Parsley | Mar 9 | May 25–Jun 1 | 128 | fits: 70 days to maturity, 128 available after May 25. | Jul 8 |
| Celery | Mar 9 | May 25–Jun 8 | 128 | fits: 120 days to maturity, 128 available after May 25. | — |
| Scallions | Mar 9 | Apr 20–May 4 | 177 | two-plantings: Plant Apr 20 and again by Aug 1; both mature before Oct 14. | Aug 1 |
| Turnip | — | Apr 20–May 4 | 177 | two-plantings: Plant Apr 20 and again by Aug 11; both mature before Oct 14. | Aug 11 |
| Kohlrabi | — | Apr 6–Apr 20 | 191 | two-plantings: Plant Apr 6 and again by Aug 6; both mature before Oct 14. | Aug 6 |
| Bok Choy | Apr 20 | May 11–May 18 | 142 | two-plantings: Plant May 11 and again by Aug 2; both mature before Sep 30. | Aug 2 |
| Collards | Mar 9 | Apr 20–May 4 | 177 | two-plantings: Plant Apr 20 and again by Aug 1; both mature before Oct 14. | Aug 1 |
| Cantaloupe | May 4 | Jun 1–Jun 8 | 86 | fits: 85 days to maturity, 86 available after Jun 1. | — |
| Chives | Feb 23 | May 25–Jun 1 | 142 | fits: 90 days to maturity, 142 available after May 25. | — |
| Dill | — | Mar 23–Jun 15 | 191 | two-plantings: Plant Mar 23 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Oregano | Mar 9 | May 25–Jun 1 | 142 | fits: 80 days to maturity, 142 available after May 25. | — |
| Rosemary | Feb 23 | May 25–Jun 1 | 128 | fits: 80 days to maturity, 128 available after May 25. | — |
| Sage | Mar 23 | May 25–Jun 1 | 142 | fits: 75 days to maturity, 142 available after May 25. | — |
| Thyme | Mar 9 | May 25–Jun 1 | 142 | fits: 90 days to maturity, 142 available after May 25. | — |
| Calendula | Apr 6 | May 4–May 18 | 149 | two-plantings: Plant May 4 and again by Jul 28; both mature before Sep 30. | Jul 28 |
| Cosmos | Apr 20 | May 18–Jun 1 | 114 | fits: 60 days to maturity, 114 available after May 18. | Jun 27 |
| Lavender | Feb 23 | May 18–Jun 1 | 149 | fits: 90 days to maturity, 149 available after May 18. | — |
| Marigolds | Apr 6 | May 18–May 25 | 114 | two-plantings: Plant May 18 and again by Jul 7; both mature before Sep 9. | Jul 7 |
| Melons | May 4 | Jun 1–Jun 8 | 86 | fits: 85 days to maturity, 86 available after Jun 1. | — |
| Mint | — | May 18–Jun 1 | 149 | fits: 90 days to maturity, 149 available after May 18. | — |
| Nasturtiums | Apr 20 | May 18–May 25 | 114 | fits: 55 days to maturity, 114 available after May 18. | Jul 2 |
| Pole Beans | — | May 25–Jun 8 | 107 | fits: 65 days to maturity, 107 available after May 25. | Jun 22 |
| Spaghetti Squash | May 4 | Jun 1–Jun 8 | 93 | fits: 90 days to maturity, 93 available after Jun 1. | — |
| Sunflowers | — | May 18–Jun 1 | 114 | fits: 70 days to maturity, 114 available after May 18. | Jun 17 |
| Tomatillos | Mar 23 | May 25–Jun 1 | 93 | fits: 75 days to maturity, 93 available after May 25. | May 29 |
| Watermelon | May 4 | May 25–Jun 1 | 93 | fits: 80 days to maturity, 93 available after May 25. | — |
| Yellow Squash | May 4 | Jun 1–Jun 8 | 100 | fits: 55 days to maturity, 100 available after Jun 1. | Jul 2 |
| Zinnias | Apr 20 | May 18–Jun 1 | 114 | fits: 60 days to maturity, 114 available after May 18. | Jun 27 |
Month by month in Filer
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 23), Lavender (Feb 23), Onion (Feb 23), Rosemary (Feb 23). |
| March | Start indoors: Celery (Mar 9), Collards (Mar 9), Kale (Mar 9), Oregano (Mar 9), Parsley (Mar 9), Scallions (Mar 9), +9 more. Direct sow from: Arugula (Mar 23), Beets (Mar 23), Dill (Mar 23), Peas (Mar 23), Radish (Mar 23), Spinach (Mar 23). |
| April | Start indoors: Calendula (Apr 6), Cauliflower (Apr 6), Marigolds (Apr 6), Pepper (Apr 6), Basil (Apr 13), Tomato (Apr 13), +7 more. Direct sow from: Kohlrabi (Apr 6), Cilantro (Apr 20), Turnip (Apr 20), Carrots (Apr 27). Transplant from: Broccoli (Apr 20), Brussel Sprouts (Apr 20), Cabbage (Apr 20), Collards (Apr 20), Kale (Apr 20), Lettuce (Apr 20), +2 more. Plant: Strawberry (Apr 13). |
| May | Start indoors: Butternut Squash (May 4), Cantaloupe (May 4), Melons (May 4), Pumpkin (May 4), Spaghetti Squash (May 4), Watermelon (May 4), +2 more. Direct sow from: Potatoes (May 4), Sunflowers (May 18), Beans (May 25), Pole Beans (May 25). Transplant from: Calendula (May 4), Swiss Chard (May 4), Bok Choy (May 11), Cauliflower (May 11), Cosmos (May 18), Lavender (May 18), +15 more. Last frost around May 18. Last sowing dates: Tomatillos (May 29). |
| June | Transplant from: Butternut Squash (Jun 1), Cantaloupe (Jun 1), Cucumber (Jun 1), Eggplant (Jun 1), Melons (Jun 1), Pepper (Jun 1), +6 more. Last sowing dates: Eggplant (Jun 3), Corn (Jun 5), Sunflowers (Jun 17), Brussel Sprouts (Jun 22), Pole Beans (Jun 22), Basil (Jun 27), +4 more. |
| July | Last sowing dates: Nasturtiums (Jul 2), Okra (Jul 2), Yellow Squash (Jul 2), Zucchini (Jul 2), Cauliflower (Jul 3), Beans (Jul 4), +10 more. |
| August | Last sowing dates: Collards (Aug 1), Scallions (Aug 1), Bok Choy (Aug 2), Lettuce (Aug 2), Kale (Aug 6), Kohlrabi (Aug 6), +4 more. |
| September | Direct sow from: Garlic (Sep 23). First frost around September 23. |
| October | Last sowing dates: Garlic (Oct 14). |
| 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 Filer, ID (ZIP 83328)?
The median last spring frost date for Filer, ID (ZIP code 83328) is around May 18. 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 29; one in ten it runs past June 7.
What is the first fall frost date in Filer, ID?
The median first fall frost date for Filer, ID is around September 23. 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 Filer, ID?
The frost-free growing season in Filer is about 128 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 Filer (128 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 16 get two plantings, 2 need an indoor start, 1 crop is perennial.
What USDA hardiness zone is Filer, ID?
Filer, ID 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 Filer, ID?
Start tomatoes indoors Apr 13 and plant out Jun 1 in Filer. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Filer?
Two: plant Apr 20 and again by Aug 2; both mature before Sep 30.
When do I plant garlic in Filer?
Sep 23 to Oct 14; it overwinters and is ready the following summer.
Can I grow Butternut Squash in Filer?
Yes, with help. Even planted out Jun 1, the outdoor season is about 7 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Twin Falls (ZIP 83301) has 135 frost-free days, 7 more than Filer (ZIP 83328). See Twin Falls ZIP 83301 frost dates
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